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Haryana State Board HBSE 7th Class Science Solutions Chapter 16 Water: A Precious Resource Textbook Exercise Questions and Answers.

Haryana Board 7th Class Science Solutions Chapter 16 Water: A Precious Resource

HBSE 7th Class Science Water: A Precious Resource Textbook Questions and Answers

Question 1.
Mark ‘T” if the statement is true and ‘F’ if it is false:
(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/F)
(b) Water shortage is a problem faced only by people living in rural areas. (T/F)
(c) Water from rivers is the only source for irrigation in the fields. (T/F)
(d) Rain is the ultimate source of water. (T/F)
Answer:
(a) T, (b) F, (c) F, (d) T.

Question 2.
Explain How gropndwater is recharged?
Answer:
The ground water get recharged through the process of infiltration. Infiltration means seeping in water from rivers and lakes into the empty spaces and crack deep below the ground.

Question 3.
There are ten tubewells in a lane of fifty houses. What could be the long term impact on the water table?
Answer:
The effect on the water table depends on the replenishment of the underground water. As only five families will share a tubewell, the water used for daily domestic purpose will not effect the water table as such. But if there is acute shortage of rains the water used by the families will not replenished and water table will fall down.

Question 4.
You have been asked to maintain a garden. How will you minimise the use of water?
Answer:
The water is used to water the plants in a garden. To minimise the wastage of water we will use the technique of drip irrigation, which directly throws water at the base of plants. I will Check the leakages in the water papers. I will arrange small pits for rain water harvesting, The collected rain water will be used for watering loiter.

Question 5.
Explain the factors responsible for the depletion of water table.
Answer:
Various factors are responsible for the depletion of water table
(i) Increased Population : Increase in the human population has increased the demand for water. As the number of humans will keep on increasing, the consumption of water will also increase. Sources of water remain limited but consumption keeps on increasing causing great fall in, water table.

(ii) Increasing industries : All industries need water. Inlith increase in human population, the number of industries has also increased; so has increased the consumption of water mainly from ground. This has caused depletion of ground water.

(iii) Agricultural activities : India is a country whose economy depends on the agriculture. With time the land used for cultivation has increased. Therefore, the consumption of water for agricultural purpose has increased. Rains are the main source of water for irrigation. But irregular rain fall has increased the dependence of farmers on the ground water. This has increased the depletion of ground water.

(iv) Lack of water conservation techniques : Main source of/water on earth and for the underground water is the rain. The water of the rain, if conserved can increase the water level. But this is not done due to the lack of rain water harvesting techniques and other water conservation techniques.

Question 6.
Fill in the blanks with the appropriate answers :
(a) People obtain groundwater through _______ and _______ .
(b) Three forms of water are _______, _______ and _______ .
(c) The water bearing layer of the earth is _______.
(d) The process of water seewage into the ground is called _______.
Answer:
(a) wells and handpumps
(b) solid, liquid and vapour
(c) aquifer
(d) infiltration

Question 7.
Which one of the following is not responsible for water shortage?
(i) Rapid growth of industries.
(ii) Increasing population.
(iii) Heavy rainfall.
(iv) Mismanagement of water resources.
Answer:
(iii) Heavy rainfall.

Question 8.
Choose the correct option. The total water
(i) in the lakes and rivers of the world remains constant.
(ii) under the ground remains constant.
(iii) in the seas and oceans of the world remains constant.
(iv) of the world remain constant.
Answer:
(iii) in the seas and oceans of the world remains constant.

Question 9.
Make a sketch showing groundwater and water tube. Label it.
Answer:

Question 10.
Explain how ground water is recharged.
Answer:
The ground water get recharged through the process of infiltration. Infiltration means seeping in water from rivers and lakes into the empty spaces and crack deep below the ground.

Extended Learning-Activities and Projects

Question 1.
Role play
You are a water detective in your school. You have a team of six members. Survey the campus and make a note of the following:
(a) Total number of taps
(b) Number of taps leaking
(c) Amount of water wasted due to leakage
(d) Reasons of leakage
(e) Corrective measures taken
Answer:
Do it yourself.

Question 2.
Groundwater pumped out
Try to find out if there are any hand pumps in your neighbourhood. Go to the owner or the users of a few of these and find out the depth at which they struck water? If there are any differences, think of the probable reason. Write a brief report and discuss it in your class. If possible, visit a place where boring is going on to install a hand pump. Watch the process and find out the depth of the water table at that place. .
Answer:
Do it yourself.

Question 3.
Catching rainwater – Traditional methods
Form groups of 4 to 5 students in the class and prepare a report on the various traditional ways of water harvesting.
Answer:
Do it yourself.

Question 4.
Conservation of water
Carry out a compaign to conserve water at home and in the school. Design posters to remind others of the importance of water resources.
Answer:
Do it yourself.

Question 5.
Create a logo
Hold a competition to create a logo or a symbol depicting water scarcity.
Answer:
Do it yourself.

HBSE 7th Class Science Water: A Precious Resource Important Questions and Answers

Very Short Answer Type Questions

Question 1.
When do we celebrate water day?
Answer:
We celebrate water day on 22nd March every year.

Question 2.
How much minimum water is required by an individual for his daily requirements?
Answer:
According to survey of United Nations every individual require 50 litres of water every day.

Question 3.
What is the main source of water on the earth?
Answer:
Rain is the main source of water on the earth.

Question 4.
Name the main sources of the natural water.
Answer:
Main source of natural water on earth are two : Surface water and underground water.

Question 5.
What are the sources of surface water?
Answer:
Rain water, River and lake water and sea water are the three sources of surface water on earth.

Question 6.
What do you mean by underground water?
Answer:
Water from rain and other sources of surface water seeps inside the earth to fill the empty spaces and crack. It is called underground water.

Question 7.
What do you mean by infiltration?
Answer:
The process of seeping of water into the empty spaces of the ground is called infiltration.

Question 8.
What do you understand by aquifer?
Answer:
Aquifer is the underground water bearing layer of the earth, which is below the water table.

Question 9.
What are main sources of underground water?
Answer:
Main sources of underground water are springs, tubewells, wells, handpumps etc.

Question 10.
What is depletion of water table?
Answer:
Falling level of water at the water table is called depletion of water table.

Question 11.
Name the factors affecting the depletion of water table.
Answer:
Increase in human population, increasing industries and increasing agricultural activities are cause of depletion of water table.

Question 12.
What is water management?
Answer:
Minimum wastage of water is called water management.

Question 13.
What is drip irrigation?
Answer:
It is a technique using narrow tubings to water plants directly at their base without wasting water.

Question 14.
What symplasm in plants show scarcity of water?
Answer:
Wilting and drying.

Question 15.
How can we utilize the rain water?
Answer:
We can store rainwater with help of rain water harvesting techniques.

Short Answer Type Questions

Question 1.
What is the role of water in sustaining life on earth?
Answer:
Water is very important in sustaining life on earth. All the metabolic functions of living beings cannot be ‘performed without water. It provides habital to several animals and plants. So no living organism can survive without water.

Question 2.
What is surface water? What are its source?
Answer:
The water present on the surface of the earth is called the surface water. It can be obtained from rain water, water from rivers and lakes sea water contains maximum surface water.

Question 3.
What is underground water and how can it be obtained?
Answer:
A part of rain water gets percolated into the ground and collect to form a water table. This water is called underground water. Underground water can be obtained from springs, wells and tubewells. Handpumps are also means of obtaining underground water.

Question 4.
What is conservation of water? How can we conserve water.
Answer:
Conservation of water is the wise and fundicious use if, water by us. We can conserve water of harvesting rain water, minimising the wastage of water in houses and industries, using conservation techniques like drip irrigation in agriculture etc. can conserve our fresh water resources.

Question 5.
What do you mean by rainwater harvesting?
Answer:
Collecting and conserving the rain water from the roof tops of the buildings is called rain water harvesting. Water from the roof tops of the houses, industries etc. is collected. It is used directly or allowed to seep into the soil instead of allowing it to flow down. It helps in raising the water table.

Question 6.
What are water-wise habits?
Answer:
Following are the water-wise habits:

• brushing teeth shaving, etc with taps turned off while not using water.
• moking floor instead of washing.
• using small cisterns in toilets.
• using a bucket and mug to take bath instead of bathing under a shower.
• using harvested rain water.

Long Answer Type Questions

Question 1.
List main sources of water explaining each one briefly.
Answer:
There are mainly two sources of natural water.
(i) Surface water : The water which is present on the surface of earth is called the surface water.
It is of three types :

• Rain water : Rain water is the main source of water on the earth. It is the purest form of natural water.
• River and Lake water : The water is rivers and lakes came from rain and melting of snow.
• Sea water : Water from rivers, lakes and streams flow into the sea. Sea water cannot be consumed because it contains various soluble salts.

(ii) Underground Water : A part of rain water predates into the soil and gets collected there. It is called underground water. It can be obtained from the following :

• Spring Water : Some times the water that is collected above the rocks exert pressure. Consequently it comes out from any opening in the earth. It is called spring water.
• Well Water : Water collected inside the earth is called water table. Wells are dug to obtain water, borings are made to instal a hand pump or a tube well.

Question 2.
List the cause and effects of water scarcity.
Answer:
Cause of water scarcity : Following reasons cause the scarcity of fresh water on earth :
(а) Uneven Distribution of water :
There is uneven rainfall on the earth. Some places receive planty of rainfall while others do not receive any rain. Almost about half of the earths land area does not get sufficient rain.

(b) Lack of conservation facilities : Most of the rain water goes waste as it cannot be absorbed in the earth. It runs into other resources like sea, rivers etc. This water otherwise can be percolated into the soil and raise water table. Constructing small reservoirs, artificial lakes and other storage facilities can increase the water table.

(c) Pollution of water : Considerable amount of consignable water gets polluted due to human and industrial activities. This water if not polluted, can be consumed by human beings.

Effects following are the effects of water scarcity :

• acute shortage of water.
• drying up of pumps and lakes.
• failure of crops thus shortage of food.
• death of man and cattle.

Water: A Precious Resource Class 7 HBSE Notes

• Water is a vital natural resource.
• Main sources of natural water are surface water and underground water.
• Rain is the main source of water on the earth.
• Rainwater river and lake water and seawater are the sources of surface water.
• Springwater tubewells hand pumps are the means of obtaining under groundwater.
• level of water under the ground is called water table.
• Infiltration is the seeping of rainwater into the soil.
• Infiltration increases the water table.
• Excess usage of groundwater depletes the water table.
• Rainwater harvesting, drip irrigation etc. helps in conserving water.
• Increase in population, increase in industries, etc. Cause scarcity of water.
• Security of water can snatch away the greenry from the earth.

Haryana State Board HBSE 7th Class Science Solutions Chapter 17 Forests: Our Lifeline Textbook Exercise Questions and Answers.

Haryana Board 7th Class Science Solutions Chapter 17 Forests: Our Lifeline

HBSE 7th Class Science Forests: Our Lifeline Textbook Questions and Answers

Question 1.
Explain how animals dwelling in the forest help it grow and regenerate.
Answer:
Animals help in growing and regenerating forests in many ways. Animals work as the cleaning agents in the forest micro-organisms work on the dead bodies of plants and animals and degenerate them. This also renourishes the soil of the forest with the nutrients broken by the micro-organisms. Animals also help in dispersing the seeds of various plants and help in their pollination. This helps in growing a number of plants, which serve as a food for a number of herbivorous animals. Herbivores helps the carnivores to grow as they serve as food for them. Thus, the flora and fauna grows the in forests.

Question 2.
Explain how forest prevent floods.
Answer:
Forests can absorb a lot of water. The roots of the trees absorb the water and prevent it from flowing away. This helps in preventing floods.

Question 3.
What are decomposers? Name any two of them. What do they do in the forest?
Answer:
Decomposers are the organisms which feed on the dead bodies of the plants and animals. They clean the forests of the decaying dead bodies and replensish the nutrient back to the forest soil e.g. beetles and grubs.

Question 4.
Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Answer:
Plants release Oxygen in the atmosphere during the process called photosynthesis. This oxygen is inhaled by the animals living in the forest for their respirations. During respiration, they release carbon dioxide, which is absorbed by plants. In this way the O₂ – CO₂ cycle goes on in the forest.

Question 5.
Explain why there is no waste in a forest.
Answer:
There is no waste in the forest because decomposers convert all the dead bodies of the plants and animals into the humus. Humus gets added to the soil and no waste is remained.

Question 6.
List five products we get from forests?
Answer:
Products we get from forests:

• We get wood from forests which is used for many purposes like making furniture, paper etc.
• We get medicines from forest.
• We get fodder for our animals from forest.
• We get gum, wax etc.

Question 7.
Fill in the blanks :
(a) The insects, butterflies, honeybees and birds help flowering plants in __________.
(b) A forest is a purifier of __________ and __________.
(c) Herbs form the __________ layer in the forest.
(d) The decaying leaves and animals droppings in a forest enrich the __________.
Answer:
(a) pollination
(b) water and air
(c) lowest layer
(d) soil as humus.

Question 8.
Why should we worry about the conditions and issues related to forests far from us?
Answer:
We should be worried about deforestation, as it would lead to floods, increase in earth’s temperature, depriving animals of their habitats and soil erosion.

Question 9.
Explain why there is a need of variety of animals and plants in a forest.
Answer:
Animals and plants sustain the forest life CO₂ – O₂ cycle goes on in the forest due to animals and plants. Animals convert the dead plants and animals into humus and increase the fertility of soil. All food cycles and food webs need variety of plants and animals.

Question 10.
In Fig. the artist had forgotten to put the labels and directions on the arrows. Mark the directions on the arrows and label the diagram using the following labels :
clouds, rain, atmosphere, carbon dioxide, oxygen, plants, animals, soil, roots, water table.

Answer:
(See. Fig.)

Question 11.
Which of the following is not a forest product?
(i) Gum
(ii) Plywood
(iii) Sealing wax
(iv) Kerosene
Answer:
(iv) Kerosene

Question 12.
Which of the following statements is not correct?
(i) Forests protect the soil from erosion.
(ii) Plants and animals in a forest are not depedent on one another.
(iii) Forests influesce the climate and water cycle.
(iv) Soil helps forest to grow and regenerate.
Answer:
(ii) Plants and animals in a forest are not depedent on one another.

Question 13.
Micro-organisms act upon the dead plants to produce
(i) sand
(ii) mushrooms
(iii) humus
(iv) wood
Answer:
(iii) humus

Extended Learning-Activities and Projects

Question 1.
The Department of Environment is to decide whether some portion of a forest in your area could be cleared for a housing complex. Write a letter to the department explaining your point of view as a concerned citizen.
Answer:
Do it yourself.

Question 2.
Visit a forest. Here is a list of points that would make your visit more fruitful.
(а) Make sure that you have permission to go into the forest.
(b) Make sure that you can find your way around. Get a map and go along with some one who is familiar with the area.
(c) Keep a record of the things you see and do. Observations make the visit interesting. Sketches and photographs are useful.
(d) You may record bird calls.
(e) Collect different kinds of seeds or hard fruits like nuts.
(f) Try to recognise various types of trees, shrubs, herbs, etc. Make lists of plants from different places in the forest and of diferent layers. You may . not be able to name all the plants, but it is worth recording and seeing where they grow. Make a record of approximate heights of plants, crown shape, bark texture, lea size, and flower colour.
(g) Learn to recognise the animal’s droppings.
(h) Interview the forest officials and the people of surrounding villages and other visitors.
Answer:
Do it yourself.

HBSE 7th Class Science Forests: Our Lifeline Important Questions and Answers

Very Short Answer Type Questions

Question 1.
Write three things we get from forests.
Answer:
Wood, gum and medicine

Question 2.
What is a forest?
Answer:
Forest is a place hosting a number of plants and animals.

Question 3.
Which plants constitute canopy in forests?
Answer:
Tall and giant trees.

Question 4.
Which plants constitute the understoreys in forest?
Answer:
Shrubs, tall grasses and small trees.

Question 5.
What is the basic unit of any food chain?
Answer:
Plants.

Question 6.
Draw any simple food chain going on in the forest.
Answer:
Grass → insects → frog snake → eagle.

Question 7.
What is Humus?
Answer:
Humus is a dark coloured substance which is formed from the dead bodies of plants and animals.

Question 8.
What are decomposers?
Answer:
The micro-organisms which decompose the dead bodies of the plants and animals are called decomposers.

Question 9.
Who helps in the dispersal of seeds of plants in the forest?
Answer:
Animals and wind helps in dispersal of seed.

Question 10.
How does forest help in preventing floods?
Answer:
Forests absorb the rain water in the soil and prevent the floods.

Question 11.
Why the noise pollution is less in the areas situated near the forests?
Answer:
Forest absorb the noise and prevent noise pollution.

Question 12.
What is deforestation?
Answer:
Cutting and destroying the forest is called deforestation.

Question 13.
What are the effects of deforestation?
Answer:
Floods, rising temperature, scarcity of food and wood and disturbed food chains are the results of deforestation.

Question 14.
How can we preserve our forest wealth?
Answer:
We can preserve our forest wealth by planting more and more trees.

Question 15.
What do you mean by afforestation?
Answer:
Planting more trees is called afforestation.

Short Answer Type Questions

Question 1.
Write any four products we get from forests.
Answer:

• We get wood from the forests.
• We get medicinal plants from the forests.
• We get gum and paper from the forests.
• We get food from forests in form of plants and animals.

Question 2.
What kind of flora is found in the forest?
Answer:
We can find wide variety of plants in the forest. We can find huge and giant trees. We can find small trees and shrubs. Various small plants like shrubs and grasses are also found in the forest.

Question 3.
What is a food chain?
Answer:
All the living components of the forest depend upon each other for their food. This interdependence of one organism on other for food is called a food chain.

Question 4.
What do you mean by micro-organisms?
Answer:
Micro-organisms as the name suggest are very small organisms. These organisms are so small that they cannot be seen with naked eyes. They can be seen under a microscope only e.gt bacteria, yeast etc.

Question 5.
What are decomposers?
Answer:
Decomposers are the micro-organisms which feed on the dead bodies of the plants and animals. They convert the dead bodies of these plants and animals into fertile humus.

Question 6.
How forests help in bringing rain?
Answer:
Trees absorbs water from the soil through their roots. They then release the excess of water through the process of transpiration in the form of water vapours. These water vapours form clouds and clouds bring rain.

Long Answer Type Questions

Question 1.
List the utility of forests.
Answer:
Forests are indispensible for us. They play an important role in our lives and in our environment.
Following are the importance of the forests:
(i) Forests give us a number of products which are very useful for us. They provide us wood. Wood is used to make furniture, house, toys, sports and fuel. Forests give us many medicinal plants. They give us gum, wax, catechu fruits, fodder and many more things.

(ii) Forests help in causing rains.

(iii) Forests maintain the temperature of the earth.

(iv) Forests maintain the O₂ – CO₂ cycle going on in the environment.

(v) Forests maintain the water-cycle going on in the environment.

(vi) Forests prevent many climate disaters like flood and draughts.

(vii) Forest provide shelter to a lot of wild life.

Question 2.
How forest sustain various variety of animals?
Answer:
Forests have different types of animals in it. Herbivores, Carnivores and Scvengers etc. Forest provide all the conditions necessary for their living. They get their food in the forest itself. The herbivores get their food in the form of plants. Carnivores eat the herbivores and systain their lives. Scavengers live on the dead bodies of all these animals and plants. Various invisible micro-organisms also live in forest. These micro-organisms are called decomposers. They convert the dead remains of animals and plants into the fertile humus.

Question 3.
What is the importance of scavengers and decomposers in the forests?
Answer:
A number of animals and plants live in forests. When they die, no body cremate their dead bodies. They keep on lying there. Scavengers like vultures, eagles etc. eat their dead bodies. They eat the flesh and other soft orgAnswer: The rest of the dead bodies are broken down by various micro-organisms called decomposers. They decompose the dead bodies of animals and plants into a dark substance called humus which is very nutritious for the soil. If scavengers and decomposers do not eat the dead bodies of animals and plants, the forest would become a big store of dead bodies and unfit for any wild life. This would disturb the whole environmental balance.

Forests: Our Lifeline Class 7 HBSE Notes

• A major part of our land is covered with forest.
• Forests are very important renewable resource.
• Forest help in maintaining the CO₂-O₂ cycle in our environment.
• They serve as a habitat to a number of plants and animals.
• Forests are indispensible for human life.
• A lot of variety of small and big plants can be found in forests.
• Different species of animals and birds live in the forest.
• All the biotic and abiotic components of the forest are interrelated with each other.
• All these components serve as complementary to each other.
• Forests save the soil erosion and maintain the water table beneath the soil.
• They cause the rains and maintain the water cycle.

Haryana State Board HBSE 7th Class Science Solutions Chapter 18 Wastewater Story Textbook Exercise Questions and Answers.

Haryana Board 7th Class Science Solutions Chapter 18 Wastewater Story

HBSE 7th Class Science Wastewater Story Textbook Questions and Answers

Question 1.
Fill in the blanks :
(a) Cleaning of water is a process of removing _________.
(b) Wastewater released by houses is called _________.
(c) Dried _________ is used as manure.
(d) Drains get blocked by _________ and _________.
Answer:
(a) pollutants
(b) sewage
(c) sludge
(d) chemicals, kitchenwaste.

Question 2.
What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas.
Answer:
Sewage is a liquid containing wastes disposed off by household, industrial and agricultural, activities in water. It is dangerous to release untreated sewage in water because it can pollute the whole source of water. Sewage contain harmful substances and disease causing organisms. It is therefore, dangerous and unsafe to release untreated sewage in water.

Question 3.
Why should oils and fats be not realeased in the drain? Explain.
Answer:
Oils and fats should not be released in, the drains because they harden the soil in the pipes and block them. Fats get clogged in the holes of the soil in the drain and block it. It does not allow the wastewater to flow and thus the whole sewer system is blocked.

Question 4.
Describe the steps involved in getting clarified water from wastewater.
Answer:
Water is treated physically, chemically and biologically in wastewater treatment plant.
Following Steps are involved in the purification of water:
(i) At first stage all the physical impurities like stones, rags, napkins, plastic bags, cans, packets etc. are removed. It is done by passing the water through bar screens.

(ii) Then water is taken to grit and sand removal tank where impurities are removed by sedimentation.

(iii) Solids impurities and faeces etc. are collected from the bottom of the water. These solid impurities collected are called sludge. Water is cleared of floatable solids like oil and grease.

(iv) Clarified water is cleared of other impurities by aerator. All disease causing bacteria are removed by chlorination and water is released in various water bodies.

Question 5.
What is sludge? Explain how it is treated.
Answer:
Sludge is the collected solid waste from the wastewater during the treatment in water treatment plant. Sludge is decomposed in a separate tank by the anaerobic bacteria. Activated sludge is used as manure.

Question 6.
Untreated human excreta is a health hazard. Explain.
Answer:
Untreated excreta can cause a lot of health related problems. It pollutes soil, water and air. The polluted water contain disease causing bacteria, which can spread epidemics like cholera, meningities etc.

Question 7.
Name two chemicals used to disinfect water.
Answer:
Chlorine and ozone are the chemical used to clean the wastewater.

Question 8.
Explain the function of bar screens in a wastewater treatment plant.
Answer:
Bar screens clear the wastewater of all the physical impurities. Large waste objects like napkins, plastics, can sticks, rags etc. are, removed from the wastewater through the bar screens.

Question 9.
Explain the relationship between sanitation and disease.
Answer:
Sanitation and disease are related each other. It sanitation is there no disease will occur, but if the sanitation is not there various types of diseases will occur and spread. So sanitation should be kept to avoid diseases.

Question 10.
Outline your role as an active citizen in relation to sanitation.
Answer:
As active citizen we should take care of our personal and environmental sanitation. We should make people around us, aware of the benefits of sanitation we should help the municipal corporations and gram panchayats to cover all the open drains and remove the unhygenic and disease causing substances thrown in’open.

Question 11
Here is a crossword puzzle : “Good luck !

Across:
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human body

Down:
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water
Answer:

Question 12.
Study the following statements about ozone:
(a) It is essential for breathing of living organisms.
(b) It is used to disinfect water.
(c) It absorbs ultraviolet rays.
(d) Its- proportion in air is about 3%.
Which of these statements are correct?
(i) (a), (b) and (c)
(ii) (b) and (c)
(iii) (a) and (d)
(iv) All four
Answer:
(b) and (c)

Extended Learning – Activities and projects

Question 1.
Construct a crossword puzzle of your own using the keywords.
Answer:
Do it yourself.

Question 2.
Then and now; Talk to your grand parents and other elderly people in the neighbourhood. Find out the sewage disposal systems available to them. You can also write letters to people living in far off places to get more information. Prepare a brief-report, on the information you collected.
Answer:
Do it yourself.

Question 3.
Visit a sewage treatment,plant.
It-could be as exciting and enriching as a visit to a zoo, a museum, or a park. To guide your observation here are a few suggestions.
Record in your notepad :
Place _________ Date _________ Time Name of the official at the plant _________ Guide/Teacher _________.
(a) The location of the sewage plant.
(b) Treatment capacity.
(c) The purpose of screening as the initial process.
(d) How is air bubbled through the aeration tank?
(e) How safe is the water at the end of the treatment? How is it tested?
(f) Where is the water discharged after treatment?
(g) What happens to the plant during heavy rains?
(h) Is biogas consumed within the plant or sold to other consumers?
(i) What happens to the treatment sludge?
(j) Is there any special effort to protect nearby houses from the plant?
(k) Other observations.
Answer:
Do it yourself.

HBSE 7th Class Science Wastewater Story Important Questions and Answers

Very Short Answer Type Questions

Question 1.
Write different sources of wastewater?
Answer:
Household activities, industrial activities and agricultural activities.

Question 2.
Name certain organic impurities in the wastewater.
Answer:
Animal waste, Human faeces, oil and urine, fruits and vegetables.

Question 3.
Write certain Inorganic impurities in, the wastewater.
Answer:
Metals, phosphates and nitrates.

Question 4.
Name certain disease causing micro-organism.
Answer:
Bacterias, Viruses etc.

Question 5.
Which process removes the solids like faeces and other substances from the wastewater?
Answer:
Grit and sand removal tank.

Question 6.
Which instrument is used to remove floatable solids from the wastewater?
Answer:
A skimmer is used to remove floatable impurities.

Question 7.
Who decomposes the sludge?
Answer:
Anaerobic bacteria decompose the sludge.

Question 8.
What helps to clean the clarified water?
Answer:
Aerobic bacteria helps to clean the clarified water.

Question 9.
Why is ozone and chlorine used?
Answer:
Ozone and Chlorine is used to kill the bacteria etc. present in the clarified water.

Short Answer Type Questions

Question 1.
How is water’polluted?
Answer:
Water is used for various’purposes in homes, industries and agriculture. When water is used for cleaning, bathing, washing, dying etc. it pollutes the water. Unwanted waste materials and chemicals etc. get added in the water and this wastes the water.

Question 2.
How “bar screen” and ‘grit and sand removal tank’ help in clarification of water?
Answer:
When wastewater is passed through bar screens it separates big and large objects like plastics, bags, sticks, can, napkins etc. In grit and sand removal tank other solid impurities like pebbless and etc. are removed.

Question 3.
How is sludge treated?
Answer:
Sludge is the solid impurities separated from the sewage. It is removed and treated in a separate tank with anaerobic bacteria. During this process biogas is produced which is used to produce electricity. Dried sludge is used as manure.

Question 4.
What are the problem arising due to open drains and other unsanitary conditions?
Answer:
Open drains and unsanitary conditions produce bad smell. It becomes an idle place of breeding for mosquitoes, files and other harmful insects. These insects spread many harmful diseases and other health hazards.

Question 5.
How the kitchen waste blocks the drains?
Answer:
Kitchen waste like oils and fats clogs the pores in soil and reduce the Alteration process. It also blocks the pipes by hardening the pipes. Wastes like tealeaves solid food remains, cotton etc. also choke the pipes and slows down flow of oxygen. This slows down the decomposition process by the aerobic bacteria.

Long Answer Type Questions

Question 1.
How defection in open cause health hazards?
Answer:
Due to lack of proper sewage disposal system a large amount of people in India defecates in open. They use riverbeds, railway lines, fields and drains for this purpose. These excreta dries down and percolate, in soil with rain water. It pollutes the ground water. Excreate along river bed pollutes the river water. In this way water on the ground and under the ground get polluted. This polluted water contains the micro-organisms of various communicable diseases like cholera, typhoid, hepatilis and meningiti it is dysentry etc.

Wastewater Story Class 7 HBSE Notes

• Water is a precious natural resource.
• We cannot imagine our lives without water.
• We waste a lot of water daily in various household and industrial activities Such water is called wastewater.
• The wastewater produced during household activities, industrial activities, and various agricultural processes is also called sewage.
• Sewage is the liquid waste that can cause various diseases and environmental hazards if not managed.
• Sewage is collected from its sources and treated to destroy its harmful constituent to clean it.
• It is made usable in treatment plants and disposed of in various sources of water.
• Drainage systems should be covered to avoid communicable diseases.
• We should not throw waste in the open and should not defecate in open.
• Low-cost disposal methods can be adopted in areas where a proper sewer system is not available.

Haryana State Board HBSE 6th Class Science Solutions Chapter 8 Body Movements Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 8 Body Movements

HBSE 6th Class Science Body Movements Textbook Questions and Answers

Exercises

Question 1.
Fill in the blanks:
(a) Joints of the bones help in the ________ of the body.
(b) A combination of bones and cartilage form the ________ of the body.
(c) The bones at the elbow are joined by a ________ joint.
(d) The contraction of the ________ pulls the bones during movement.
Answer:
(a) movement
(b) skeletal
(c) balls socket
(d) muscles

Question 2.
Indicate true (T) and false (F) among the following sentences :
(a) The movement and locomotion of all animals is exactly the same.
(b) The cartilage is harder than bones.
(c) The finger bones move in one plane.
(d) The forearm has two bones.
(e) The cockroach have an exoskeleton.
Answer:
(a) False
(b) False
(c) True
(d) True
(e) True.

Question 3.
Match the items in column I with appropriate items of column II.

Answer:
(i) (d)
(ii) (g)
(iii) (e)
(iv) (f)
(v) (c)

Question 4.
Answer the following:
(a) What is a ball and socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backward?
Answer:
(a) The round end of one bone fits into the hollow space of the other bone. Such a kind of joint allows movements in all directions. Such joints are called ball and socket joints.
Example : Joints between the upper arms and the shoulders; the thigh and hip joints.

(b) The facial bones of our skull comprises upper and lower jaw; in which lower jaws is movable.

(c) Our elbows have hinge joint. These joints allow movement only in one plane only like a door hinge and not more than 180 degrees.

HBSE 6th Class Science Body Movements Important Questions and Answers

Very Short Answer Type Questions

Question 1.
Define tissues.
Answer:
A group of similar cells to perform special functions are called tissues.

Question 2.
What is an organ?
Answer:
Different kinds of tissues group together to perform special function is called an organ.

Question 3.
Define organ system.
Answer:
A large number of related organs group together to form an organ system.
Cells → Tissues → Organs → Organ system → Human body.

Question 4.
Give two examples of organs.
Answer:
Heart, oesophagus.

Question 5.
Name two tissues.
Answer:
Muscles tissue, Nervous tissue.

Question 6.
Name any three sense organs of our body.
Answer:
Eyes, ears and nose.

Question 7.
What are the organs of respiration in man?
Answer:
Nostrils, trachea, bronchi, lungs and muscles.

Question 8.
Why do animals move?
Answer:
Animals move from one place to another in search of food, mate and to defend themselves from enemies.

Question 9.
Where do the following animals live?
Whale, elephant and frog
Answer:
Water, forest, water.

Question 10.
Give the names of two vertebrate animals.
Answer:

• Man
• Horse.

Question 11.
Name two major groups of animals.
Answer:

• Vertebrate
• Non-vertebrate.

Question 12.
What is the function of hair in our nose?
Answer:
They prevent dust and smoke particles from entering enter our body.

Question 13.
Name the organs connected by food pipe.
Answer:
Larynx.

Question 14.
Name the pumping organ in our body.
Answer:
Heart.

Question 15.
Give the full form of RBC.
Answer:
Red blood corpuscles.

Question 16.
Name two single-celled animals.
Answer:
Amoeba, Paramecium.

Question 17.
Define the term “cell”.
Answer:
Structural and functional unit of life is called cell.

Question 18.
What is the normal rate of heart beat?
Answer:
70-72 beats per minute.

Question 19.
What are external organs?
Answer:
The organs which can be seen from outside are called external organs.

Question 20.
Name three external organs.
Answer:
Hand, leg and mouth.

Question 21.
How many organ systems do we have?
Answer:
We have ten organ systems.

Question 22.
What is our skeleton made up of?
Answer:
Our skeleton is made of bones and cartilage.

Question 23.
What is the main function of our skeleton system?
Answer:
It gives support to the body and protects the inner organs.

Question 24.
What are bones and cartilages?
Answer:
The hard structures are bones and cartilages are comparatively soft and elastic.

Question 25.
How many vertebrae are found in our back bone?
Answer:
The back bone is composed of 33 small ring-like vertebrae joined end to end.

Question 26.
What are the regions of a backbone?
Answer:
Back-bone has five regions. From the top they are neck, chest, belly, hip and tail.

Question 27.
Which bone forms the shoulder bone?
Answer:
Shoulder bone is formed by the collar bone and the shoulder blade.

Question 28.
Our forearm has bones.
Answer:
Two.

Question 29.
How are bones joined together?
Answer:
Bones are held together at joints by strong cords called ligaments.

Question 30.
What are hinge joints?
Answer:
These joints allow movement only in one plane not more than 180 degrees.,

Question 31.
How do muscles move the bones?
Answer:
The muscles move the bones by contraction.

Question 32.
Define movement.
Answer:
When organisms move their body parts without changing their position.

Question 33.
What is locomotion?
Answer:
When animals move from one place to another place. This kind of movement is called locomotion.

Question 34.
How do fishes move?
Answer:
They move with the help of tail fins and anal fins.

Question 35.
How does a cockroach move?
Answer:
Cockroach has distinct muscles attached with skeletal process. These muscles move the body.

Short Answer Type Questions

Question 1.
Define tissue, organ and organ system.
Answer:
→ Tissue : A group of similar cells to perform special functions. These group of cells are called tissues.

→ Organ: Groups of different kinds of tissues which perform special functions are called organs. Each organ of the body has a different structure.

→ Organ system: A large number of related organs together form an organ system. Cells → organ → organ system human body.

Question 2.
Give two examples of each : tissues and organs.
Answer:

• Tissues : Muscles tissues, Nerve tissues.
• Organ : Heart, stomach.

Question 3.
Why do animals move?
Answer:
Animals move from one place to another place due to the following reasons:

• In search of food
• In search of mate and to protect from enemies.

Question 4.
What is the function of our brain?
Answer:
Brain controls our body activity. It is also the centre of memory and learning.

Question 5.
How does a cockroach move?
Answer:
Cockroach also walks and climbs on the wall and flies in the air. It has three pairs of joined legs attached to the breast region. These help in walking. It has distinct muscles in the breast region which move the wings during flight.

Question 6.
Are nails and hairs organs?
Answer:
No, our hairs and nails have important uses. They are produced by the skin, but they are not organs. Because as they grow, they become dead. They can be cut without pain or bleeding.

Question 7.
Define movement in snakes.
Answer:
Locomotion in snakes is like swimming on land. They make many loops at the sides. It is mainly the forward thrust to move forward. They also hitch the skin and body alternately dragging the ventral scales on the ground. Some snakes can swim well in water.

Question 8.
Define skeletal system.
Answer:
Our skeletal system is made up of many bones and cartilages. The bones are hard and cartilages are soft and elastic. It gives support to the body It protects internal organs. Together with muscles it gives shapes to our body. Narrow bone produces red blood cells and some white blood cells.

Question 9.
What are chest bones?
Answer:
Chest is a cone-shaped cage. It encloses the hearts and the lungs. At the back are the vertebrae 12 pairs of ribs curve round .the sides. Ribs are attached to the sides of each vertebrae. Ten of them are also attached by cartilage to the breast bone at the front. Two ribs are free. The ribs are joined in such a way that they allow the needed movement of the chest during breathing.

Question 10.
Define the bones present in our hand.
Answer:
The hand comprises the upper arm, fore-arm, wrist, palm and lingers. The upper arm has one long bone, and fore-arm has two long bones. Wrist is made up of several small bones. The palm is composed of fine slightly longer bones. There are three small bones in each finger.

Question 11.
What is the correct sitting postures?
Answer:
In correct position, one should sit straight and relaxed. One should not bend in front or lean backwards. The fore-arm should be at the same level. The feet should be in rest on the floor. Lower leg should be erect making a right angle at the knee.

Question 12.
Define the following:
(a) Fixed joints, (b) Ball and socket joints,
Answer:
(a) Fixed joints: Some attachments do not allow movements. They are fixed joints. Joint of cranium is a fixed joint.

(b) Ball and socket joints : The rounded end of one bone fits into the hollow space of the other bone. Such a kind of joint allows movements in all directions. Examples : The joints between the upper arm and shoulder, the thigh and the hip joint.

Question 13.
What are bone joints and from what are they joint?
Answer:
The place where two bones or more than two bones meet together is called a joint. There are various kinds of joints. They are held together at joints by strong cords called ligaments.

Question 14.
What is locomotion? Where is it found?
Answer:
Animals move from one place to another for various purposes. This kind of movement is called locomotion. Locomotion is found only in animals. Locomotion helps them in search of food and shelter. It also helps them escape from their enemies.

Question 15.
Answer the following questions:
(a) What is an organ system?
(b) Which of the skull bones are movable?
(c) Which of the external organs are supported by cartilages?
(d) Draw and label the bones of the leg.
Answer:
(a) When several organs group together as a team to carry out a major activity, such a set of organs is called an organ system.

(b) The facial bones comprise the upper and lower jaws and a few other bones. The bones of lower jaw are movable.

(c) The back bone and its 24 vertebrae are joined by cartilages. Thus it forms a hollow bony tube. Nose, ear and various joints are joined by cartilage.

Long Answer Type Questions

Question 1.
Define the locomotion in snail.
Answer:
The body of a snail is covered with a hard and flexible shell. It has an opening with a lid. Through the opening of the shell, a strong muscular foot and head comes out. The foot is a part of its belly. When it starts moving, the wavy motion of the foot can be seen. The movement is very slow.

Question 2.
How does an earthworm move?
Answer:
The body of a mature earthworm seems to be made of many rings joined end to end. From the paler under surface of the body a large number of minute bristles project out. The bristles are connected with muscles at their bases.

The bristles help to get a good grip on the ground. There are muscles in the body wall which help to extend and shorten the body. During movement, the earthworm first extends the front part of the body, keeping the rear fixed to the ground. Then it fixes the front end and releases the rear end. Thereafter it shortens the body and pulls the rear end forward. The earthworm follows this process repeatedly to move ahead. On a slippery surface, its movement is affected due to the loss of the grip on the surface.

Body Movements Class 6 HBSE Notes

• The various kinds of animals differ in shape, size and habitat. Therefore their body parts and their working also vary widely.
• The human body have many parts which have definite functions. They are called organs.
• Both external and internal (parts) organs are made of many cells and tissues, but every organ works as a single unit.
• The organs group together as a team to perform a major activity. A set of such organs forms an organ system.
• There are ten organ systems which in coordination with one another perform all the life activities.
• Hard structures such as bones and cartilages form the skeletal system of man. It gives the frame and shape to the body and help in movement. It protects internal organs and bones also form red blood cells and some white blood cells.
• The skeletal comprises of the skull, the back bone, ribs and the breast bone.
• The skeletal also includes the shoulder and hip bones and bones of hands and legs.
• Two bones are joined by tough cords called ligaments. The bones are joined to muscles by cord-like tendons.
• The bones are moved by alternate contractions and relaxations of two sets of muscles.
• The bone joints are of various kinds on the nature of joints and directions of movement they allow.
• Strong muscles and light bones work together to help the birds fly by flapping their wings. The fishes swim by forming loops alternately on two sides of the body. The tail pushes them forward and the vertebrates and muscles attached to them work for it. Similarly the snakes crawl on the ground by alternately looping sideways. A large no. of vertebrae and associated muscles push the body forward. The ventral scales also help in the process.
• The body and legs of insects have hard jointed coverings forming an exoskeleton. The muscles of the breast connected with three pairs of legs and two pairs of wings help the cockroach to walk and fly.
• The snails are moved by the muscular foot. The hard unjointed shell has no relation to the foot.
• The earthworm moves by alternate extension and contraction of the body effected by the muscles. The minute movable bristles help in gripping the ground.

Haryana State Board HBSE 6th Class Science Solutions Chapter 7 Getting to Know Plants Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 7 Getting to Know Plants

HBSE 6th Class Science Getting to Know Plants Textbook Questions and Answers

Exercises

Question 1.
Correct the following statements and rewrite them in your notebook.
(a) Stem absorbs water and minerals from the soil.
(b) Leaves hold the plant upright.
(c) Roots conduct water to the leaves.
(d) The number of petals and sepals in a flower is always equal.
(e) If the sepals of a flower are joined together, its petals are joined to the petals.
(f) If the petals of a flower are joined together then the pistil is joined to the petal.
Answer:
(a) Root absorbs water and minerals from the soil.
(b) Stem hold the plant upright.
(c) Stem conduct water to the leaves.
(d) The number of sepals and petals in a flower are equal.
(e) If the sepals of a flower are joined together its petals not joined together.
(f) If the petals of a flower joined together, its pistil not joined together.

Question 2.
Draw (a) a leaf, (b) a tap root and (c) a flower.
Answer:

Question 3.
Can you find a plant in your house or in your neighbourhood. Which has long but a weak stem? Write its name. In which category would you classify it?
Answer:
The plant found in our house is money plant, which has weak and long stem. Such type of stem need support and they are called climbers. Guard plant and grapevine also have climber stems.

Question 4.
What are the function of a stem in a plant?
Answer:
Functions of a stem in a plant:

• It forms a link between the roots and the other parts of a plant.
• It provides path for the conduction of water and minerals absorbed by roots to different parts of the plant.
• It bears leaf in such a way that they get maximum sunlight and support them.
• It upholds the plant upright.
• It bears the flowering parts of the plants.

Question 5.
Which of the following leaves have reticulate venation?
Wheat, Tulsi, Grass, Dhania, China rose, Maize.
Answer:
Tulsi, Dhania, China rose.

Question 6.
If a plant has fibrous root, what type of venation do its leaves likey to have?
Answer:
Parallel venation.

Question 7.
If a plant has leaves with reticulate venation, what kind of roots will it have?
Answer:
The root of plants will be tap root.

Question 8.
Is it possible for you to recognize the leaves without seeing them? How?
Answer:
Yes, we can recognize the leaves without seeing. We can recognize leaves by touching or by smelling.
Examples: Sugarcane, Bananas, Maize, Tulsi, Podina, Dhania etc.

Question 9.
Write the names of the parts of a flower:
Answer:
Parts of a flower : (i) Sepals (ii) Petals (iii) Stamens (iv) Pistil

Question 10.
Which of the following plants have you seen? Off those you have you have seen, which one have flowers.
Answer:
Do it your self.

Question 11.
Name the part of the plant which produces its food. Name this process.
Answer:
Leaf, produces their own food. The process of producing food by leaves is called photosynthesis.

Question 12.
In which part of a flower you likely to find the ovary?
Answer:
The ovary is found in pistil part of a flower.

Question 13.
Name two flowers each with joined and separated sepals.
Answer:
(a) Flowers with joined sepals are (i) sunflower, (ii) cotton.

(b) Flowers with separate sepals: (i)Rose, (ii) Mustard plant.

Question 14.
Names the parts of the plant which are hidden in this grid. Search for them by going up and down or even diagonally forward as well as backward. Have fun,
Answer:
Do it your self.

HBSE 6th Class Science Getting to Know Plants Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What are herbs?
Answer:
Small and non woody plants are called herbs.

Question 2.
Name any two herbs.
Answer:
Wheat, balsam.

Question 3.
Define shrubs.
Answer:
Medium sized plants within branches starting just above the ground.

Question 4.
Name any three shrubs.
Answer:
Heena, lemon and bougainvillea.

Question 5.
Define trees.
Answer:
Woody plants having a large single stem, which grows for some distance from the ground.

Question 6.
Give examples of three trees.
Answer:
Neem, Mango, Coconut.

Question 7.
What are non-flowering plants?
Answer:
The plants which do not bear flowers.

Question 8.
Give two examples of non-flowering plants.
Answer:
Algae, moss, fern.

Question 9.
Name two climbers.
Answer:
Money plant, bean stalk.

Question 10.
What are creepers?
Answer:
Plants which need support to stand up are called creepers.

Question 11.
What is conduction?
Answer:
The process through which water travels through stem to other parts of the plants.

Question 12.
What is leaf venation?
Answer:
The design made by veins in a leaf is called leaf venation.

Question 13.
What is node?
Answer:
The part of stem where branches and leaf attached are called nodes.

Question 14.
Define internode.
Answer:
The part of stem between two nodes is called internodes.

Question 15.
Define alternate arrangement of leaves.
Answer:
When one leaf is attached to each node, it is called alternate arrangement.

Question 16.
What is opposite arrangement of leaves?
Answer:
When two leaves arise at each node, it is called opposite arrangement.

Question 17.
What is whorled arrangement?
Answer:
When several leaves are arranged is at a node, it is called whorled arrangement.

Question 18.
Name some plants which have aerial roots.
Answer:
Sugarcane, banyan tree and money plant.

Question 19.
How many root systems are found in plants?
Answer:
Two types:

• Tap root system
• Fibrous root system.

Question 20.
Define tap root system.
Answer:
When a plant has a main root and smaller ones come out from it.

Question 21.
What are lateral roots?
Answer:
Smaller roots which come from tap root.

Question 22.
Name two roots that we eat as food.
Answer:
Radish, Sweet potato.

Question 23.
Name two underground stems.
Answer:
Potato, yams.

Question 24.
Name one plant which stores food in their leaves.
Answer:
Onion.

Question 25.
Which part of a flower makes fruit?
Answer:
Pistil.

Question 26.
Name the parts of a flower.
Answer:
Sepals, petals, stamen and pistil.

Question 27.
Name any three parts of the leaf.
Answer:
Three parts of the leaves are : (i) Lamina (ii) Midrib (iii) Petiole.

Question 28.
Leaves are …………. in colour.
Answer:
Leaves are green in colour.

Question 29.
Leaves prepare their food by a process called ………..
Answer:
Photosynthesis.

Question 30.
What type of response does not plant touch-me-not show on touching?
Answer:
When we touch the plant of touch- me-not, it folds its leaves quickly. It shows stimuli towards touch.

Question 31.
Name two animals with heterotrophic mode of nutrition.
Answer:

• Cow
• camel
• buffalo.

Question 32.
Which part of the leaf helps in exchange of gases?
Answer:
The lower part of leaf contains many minute pores, which are called stomata. These stomata help in exchange of gases.

Question 33.
List one common feature of the living and non-living objects.
Answer:
Living and non-living both have mass, shape and occupy space.

Question 34.
Name any two waste products of plants.
Answer:

• Latex
• Gum.

Question 35.
List one characteristic of living things.
Answer:
Living things reproduce.

Question 36.
Why do animals need food?
Answer:
Animals need food for growth and getting energy for doing various activities.

Question 37.
What is a cell?
Answer:
Structural and functional unit of life is called cell.

Question 38.
What is nutrition?
Answer:
The process of taking food is generally called nutrition.

Question 39.
What is respiration?
Answer:
The process of taking oxygen and giving out carbon dioxide from the body is called respiration.

Question 40.
Define excretion.
Answer:
Removal of harmful and poisonous substances from the body with the body organs is called excretion.

Question 41.
What is the food of fishes?
Answer:
Fishes feed on micro-organism and aquatic insects.

Question 42.
What is the food of frog?
Answer:
Small insects.

Question 43.
Represent photosynthesis by a chemical equation.
Answer:

Question 44.
Name one organism whose body consists of only one cell.
Answer:
Amoeba.

Question 45.
What are autotrophs?
Answer:
Living organisms (green plants) that prepare their own food.

Question 46.
What are heterotrophs?
Answer:
Living organisms (non-green plants and animals) that cannot prepare their own food.

Question 47.
Define respiration.
Answer:
Respiration is the process by which living organisms make energy.

Question 48.
What is stimulus?
Answer:
A change that produces a reaction in an organism.

Question 49.
Where do we get energy for doing work?
Answer:
We get energy from the food we take.

Question 50.
How do plants get their food?
Answer:
Plants get their food from the soil with the help of roots.

Question 51.
What happens when CO₂ is passed in lime water?
Answer:
Lime water turns milky.

Question 52.
Why do fish come on the surface in an aquarium?
Answer:
They come to take air.

Question 53.
Why is it necessary to remove waste materials from the body?
Answer:
Since some materials may be poisonous and harmful to the organism.

Question 54.
How does amoeba remove wastes from its body?
Answer:
Amoeba removes wastes through body surface.

Question 55.
How do plants remove their waste products?
Answer:
They remove their wastes in the form of latex and gum.

Question 56.
What is the process of removal of wastes by plants called?
Answer:
The process of removal of wastes in plants is called secretion.

Question 57.
How does a rose plant reproduce?
Answer:
Rose plant reproduces by cutting.

Short Answer Type Questions

Question 1.
Write a note of the need of plant classification.
Answer:
There are a great variation of plants in their size, shape and structure. So it is essential to classify plants for the ease of their study.

Question 2.
Differentiate between herb, shrub and trees.
Answer:
→ Herbs : Plants with soft stem and small in size. Examples: Tulsi, bean, gram etc.

→ Shrubs :Bushy plants, medium in size and much branched. Examples : Rose, china rose, cotton and sunflower.

→ Trees : Large, branched, wood plants. Examples: Peepal, neem, banyan etc.

Question 3.
What are the functions of leaves?
Answer:
Leaves are known as food factories of plants. They prepare their own food in their green parts using chlorophyll, water and carbon dioxide in the presence of sunlight. This process is called photosynthesis.

Question 4.
Name different parts of a leaf.
Answer:
Normally leaves are flat and green. The main parts of a leaf are:

• leaf lamina
• midrib
• tip
• petiole
• veins

Question 5.
Differentiate between flowering plants and non flowering plants.
Answer:

Question 6.
Why does the stem of cactus plant not have leaves?
Answer:
The cactus plant does not have leaves. Its green stem functions as the leaf. Leaves of this plant are modified into spines, which reduce the loss of water for living in dry areas.

Question 7.
What is the main function of root?
Answer:
Root performs the following functions:

• It fixes the plant in the soil.
• It absorbs water and minerals from the soil for the other parts of the plants.
• It holds the soil firmly, thus prevents soil erosion.

Question 8.
What are the main functions of stem?
Answer:
Functions of stem:

• It forms a link between the roots and other parts of a plant.
• It provides path for the conduction of water and minerals absorbed by roots to different parts of the plant.
• It upholds the plant upright.
• It beau’s leaves in such a way that they get maximum sunlight.
• It bears the floral parts of the plants.

Question 9.
Name the important parts of a flowering plant.
Answer:
The main parts of a flowering plant are:

• Root
• Stem
• Leaf
• Branches
• Flower
• Fruits.

Question 10.
Define supporting roots with examples.
Answer:
In some plants, a number of rope – like roots arisefrom the horizontal branches of the tree. They grow downwards and penetrate the soil acting as pillars to support the main stem and heavy branches of the tree. These roots are called prop roots. These roots are found in banyan tree, sugarcane, screwpine and maize.

Question 11.
Mention some modified roots and stems which we eat.
Answer:
Radish, carrot, potato, sweet potato, beet etc., plant roots storage food, which we eat. In some plants like ginger, onion, potato etc. stems grow underground and store food materials.

Question 12.
What imparts green colour to a leaf?
Answer:
We know that most of the leaves are green in colour. The green colour of leaves is due to a green pigment present in them. This green pigment is called chlorophyll.

Question 13.
Write three modifications each of stems and leaves.
Answer:
Modifications of roots:

• Storage roots
• Supporting roots
• Breathing roots.

Modification of stems:

• Storage of food
• support
• protection.

Question 14.
What is a fruit? How does it differ from a seed?
Answer:
After fertilization, the ovary of the flower swells up and forms the fruits, like mango, apple, orange etc. The seeds contain a store of food, usually starch. Embryo surrounded by a hard wall with embryo inside is called the seed.

Question 15.
What happens if a green plant does not get sunlight?
Answer:
If a green plant does not get sunlight, it cannot prepare its own food by the process of photosynthesis, and plants and animals will die.

Question 16.
All living organisms need food. Why?
Answer:
All living organisms need food for v’ growth, repair and replacement of worn out cells in the body and energy to perform vital activities. Food provides energy. To perform variety of A activities, animals need food. Plants get. water and minerals from soil through root hairs to their different parts of plants. Green plants prepare their own food with the help of carbon dioxide, water, chlorophyll and sunlight. The process is known as photosynthesis.

Question 17.
Distinguish between locomotion and movement in animals.
Answer:
Difference between locomotion and movement in animals:

Question 18.
Why are the green plants called autotrophs?
Answer:
Green plants are called autotrophs because they prepare their own food. Green plants utilize carbon dioxide from air, water, mineral from soil and sunlight to prepare their own food in the form of carbohydrate or simple sugar. This process of preparing food is called photosynthesis.

Question 19.
List some common features of living and non-living things.
Answer:

• All livings and non-living things have mass-shape and they occupy space.
• They are made up of structural units.
• The structural units of living and non-living things are cells and particles respectively.

Question 20.
What do you understand by a life span of a living thing?
Answer:
Different organisms have different life spans. The period for which a living being lives is called life span. Animal growth may not occur throughout the life span. Growth in animals is limited and plants and trees grow for a long period. Growth in plants and animals is influenced by several factors.

Question 21.
List the three differences between living and non-living objects.
Answer:

Question 22.
Give three differences between animals and plants.
Answer:
Difference between animals and plants:

Question 23.
State the character on the basis of which animals are divided into two categories.
Answer:
Animals which have a bony skeleton with a back bone are called vertebrates and animals which do not have a long skeleton and a back bone are called invertebrates.

Question 24.
Define excretion.
Answer:
The process of removal of some harmful and poisonous substances from the body is called excretion. In humans, the excretory products are removed from the body in the form of urine and urea.

Question 25.
What do you mean by growth?
Answer:
An increase in size, shape and body mass of an organism is termed as growth. It is an irreversible change in a living organism. The growth in animals is limited and in plants, growth is unlimited and continues till the last stage of life.

Question 26.
What is the difference between the growth of living and non-living?
Answer:
The growth in living beings is internal and irreversible. It is due to multiplication of cells and tissues. The growth in non-living is external and reversible. It is caused due to deposition of particle from outside.

Question 27.
What do you understand by the term ‘nutrition’?
Answer:
All living things depend upon food to survive. The food is the source of energy. The energy is necessory for performing various life activities. Taking of food is called nutrition.

Question 28.
What is respiration?
Answer:
Respiration is an anabolic activity during which air rich in oxygen is taken into the cell and air rich in CO₂ is given out from the cells. The oxygen is used in the oxidation of food which gives us energy.

Question 29.
Define stimulus and response.
Answer:
Any change in our surroundings is a stimulus and any reactions performed by an organism to that stimulus is response. For example the watering of mouth by seeing a tasty food. To leave the road on the left on hearing the sound of a horn. The movement of stem or flower in the direction of sunlight. These characteristics of living forms show responsiveness.

Question 30.
What is cell? What is the difference between unicellular and multicellular organism?
Answer:
The structural and functional unit of life is celled cell. Each cell has a living substance, the protoplasm. Single celled animal is called unicellular and many called organism is called multicellular organism. Example : Amoeba and cow etc.

Question 31.
Differentiate between autotrophs and heterotrophs?
Answer:
Those organisms which prepare their own food, are called autotrophs. For example : only green plants. Those organisms which cannot prepare their own food and depend upon plants or other animals for their food are called heterotrophs. For example : Man, Bacteria, Fungi, etc.

Question 32.
In what way does the intake of food help living things?
Answer:
Living things perform many activities like, playing, running, etc. The energy is required for all activities of living things. This energy is obtained from the food they take. Thus food gives living things energy. It also helps living beings in repairing the body parts. Food also protects t living things from infections and diseases.

Long Answer Type Questions

Question 1.
Draw a labelled diagram of a plant showing its various parts.
Answer:
The various parts of a plant are shown on the diagram given below:

Question 2.
What is a leaf? Draw the labelled diagram of a leaf. What are the functions of the leaves of a plant?
Answer:
Leaf: The leaf is a thin, broad, flat and green part of a plant which is attached to the stem (or branch).

The leaves of plants have three main functions:
(i) The leaves make food for the plant by photosynthesis.

(ii) The leaves get rid of excess water from the plant through transpiration.

(iii) The leaves carry out the process of respiration in plants.

Getting to Know Plants Class 6 HBSE Notes

• Plants are usually grouped in herbs, shrubs and trees on the basis of their height, stem and branches.
  Stem conducts water upwards, bears leaves, buds and flowers.
• Leaves have variety of shapes, size and other characteristics.
• The pattern of veins on the leaves is called venation. It can be reticulate or parallel.
• Leaves are attached to the stem at places called nodes. The part of stem between two nodes is called internode.
• The arrangement of leaves at the node is alternate, opposite or whorled.
• Leaves release water vapour by the process of transpiration. They prepare food by the process of photosynthesis from carbon dioxide, water, chlorophyll and sunlight.
• Roots are underground part of the plants. They absorb water and minerals from the soil and hold the soil firmly to keep a plant upright.
• Roots are mainly of two types : Tap root and fibrous root.
• Plants having leaves with reticulate venation have tap root and parallel, venation plants leaves have fibrous root.
• Stem conducts water from the roots to the leaves and food from the leaves to the roots.
• All plants do not have colourful flowers. The parts of flowers are usually present in rings.
• The various whorls are sepals, petals, stamen and pistil. Number of sepals, petals, stamen’s and pistils are different in different flowers.

Haryana State Board HBSE 6th Class Science Solutions Chapter 6 Changes Around Us Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 6 Changes Around Us

HBSE 6th Class Science Changes Around Us Textbook Questions and Answers

Exercises

Question 1.
To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Answer:
Yes, this change can be reversed.

Question 2.
You accidently dropped your favourate toy and broke it. This is a change, you did not want. Can this change be reversed?
Answer:
No, this change can not be reversed.

Question 3.
Somethings are listed in the following table. For each change write in blank column. Whether the change can be reversed or not.

Answer:
(1) Can be reversed; Yes.
(2) No.
(3) Yes.
(4) No.
(5) No.
(6) No.

Question 4.
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Answer:
No, we cannot reverse this change.

Question 5.
Give examples to explain the difference between changes that can or cannot be reversed.
Answer:
A change that can be reversed is called a reversed change. For example, blowing of a balloon, making aeroplane from a piece of paper by folding it and making ball from a dough etc. changes can be reversed. A change that cannot be reversed is called irreversible change. For example: Ripening of fruits, burning of paper and cooking of food, etc. cannot be reversed.

Question 6.
A thick coating of a paste of plaster of paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed.
Answer:
No, the change cannot be reversed.

Question 7.
A bag of cement lying in the open gets wet due to rain during the night. The next day the sunshines brightly. Do you think the changes, which have occured in the cement, could be reversed?
Answer:
No, the change cannot be reversed.

HBSE 6th Class Science Changes Around Us Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What type of change is of climate change?
Answer:
Periodic change.

Question 2.
Can deforestation be considered as a reversible change?
Answer:
No, it is not a reversible change.

Question 3.
Can you obtain wood from saw dust?
Answer:
No, we cannot reverse this change.

Question 5.
Give examples to explain the difference between changes that can or cannot be reversed.
Answer:

• Heart beat
• Phases of moon
• Swinging of the pendulum of a clock
• high and low tide in sea every day.

Question 6.
Pickling of mango is a desirable change. How?
Answer:
Pickling of mango is always a desirable change, because we pickle mango according to our taste and desire.

Question 7.
Give an example of natural change.
Answer:
Germination of seed.

Question 8.
Give an example of irreversible change.
Answer:
Burning of paper.

Question 9.
What is a physical change?
Answer:
Change in which no new product is formed.

Question 10.
What is a chemical change?
Answer:
A change in which a new substance with different properties is formed.

Question 11.
Mention two undesirable change.
Answer:

• Breaking of glass ware
• flooding of rivers.

Question 12.
Give four examples of desirable change.
Answer:

• Turning of milk into curd
• Formation of manure from animal dung
• Cleaning of utensils
• Change of season.

Question 13.
What is pasteurisation?
Answer:
Heating and cooking of milk is known as pasteurisation.

Question 14.
State two advantages of non¬periodic change.
Answer:

• Growth of plants and animals and boiling of milk.
• Washing of cloth are some advantages of non-periodic change.

Question 15.
What is solution?
Answer:
When salt is added in water, it dissolves in water to form solution which has properties that mixed to form it.

Short Answer Type Questions

Question 1.
Can deforestation be considered as a reversible change?
Answer:
Deforestation is not a reversible change because it cannot take place in reverse direction. Forest cannot be grown quickly.

Question 2.
Give four examples of non-periodic change.
Answer:

• Occurring of earthquake
• Falling of ripening fruits from tree
• Landslides
• Train accident.

Question 3.
Is burning always a desirable change?
Answer:
Burning is always not a desirable change. It causes pollution, which is not a desirable change. Burning of house is not a desirable change, because they are harmful to us.

Question 4.
What is the advantage of pasteurising milk?
Answer:
Milk is an essential commodity. Some harmful bacteria spoil it after some time. In pasteurisation, microbes are killed and milk is prevented from spoiling for several days and can be stored without refrigeration.

Question 5.
Explosion of a cracker is a chemical change. Explain.
Answer:
When we burn a cracker, it exploide. Heat, light and smoke comes out after explosion. Many new products are formed. So it is a chemical change.

Question 6.
Most physical changes are reversible. Give reasons with two examples.
Answer:
All physical changes are reversible. Because in physical changes, no new product is formed. They can be reversed easily.
Examples:
(i) Dissolving of sugar in water is a physical change and we get back sugar and water easily.

(ii) Formation of ice from water. In melting of ice, we can get water back.

Question 7.
Identify the type of change and state whether energy is evolved or absorbed in each one of the following:
Burning of a candle, lighting of a bulb, preparation of food by green plants, volcanic eruption.
Answer:

• Burning of a candle : Chemical change, energy evolved.
• Lighting of a bulb : Physical change, energy evolved.
• Preparation of food by green plants: Chemical change, energy absorbed.
• Volcanic eruption: Chemical change, energy evolved.

Question 8.
Define the term ‘interaction’.
Answer:
When two or more substances act on each other, as a result a change may take place. This is called interaction.

Question 9.
What are the differences between chemical and physical changes?
Answer:
Difference between chemical and physical changes:

Question 10.
Name two similarities between the various objects in your surroundings.
Answer:

• Each object occupies space indicated by its size and shape.
• Objects are made up of materials and some are made up of combination of materials.
• The structural units of objects are called cells and molecules respectively.

Question 11.
How do you group the objects into two main categories?
Answer:
Objects can be grouped on the basis of shape, size and colour. Objects can be categorised into living and non-living objects.

• Living objects such as plants and animals.
• Non-living objects such as stone, table, chair, etc.

Living organisms show movement, respiration, excretion, breathinbg, nutrition, reproduction and sensitivity towards heat, light, sound and touch etc.

Question 12.
Why do animals and plants respire?
Answer:
All living things perform various kinds of activities. Animals move and run around. You go to school and play. For these activities energy is required. This energy living beings obtain through the process of respiration. The oxygen is used to produce energy from the food which organisms consume. Oxygen burns the food and release energy. This energy is utilised for various activities. This can be represented as follows :

Question 13.
How is the process of photosynthesis in plants helpful to the animals?
Answer:
Plants prepare their own food by the process of photosynthesis in green leaves and plants. They prepare food in green leaves in presence of sunlight with the help of carbon dioxide and water. The food prepared by plants, all animals depend for their food on plants. In this way, photosynthesis is helpful to animals.

Long Answer Type Questions

Question 1.
State the reason for each of the following :
(i) Ripening of a fruit is a chemical change.
(ii) Rotation of fan is a periodic change.
(iii) Cooked food is stored in refrigerator.
(iv) Iron sheet is coated with tin before making a can.
Answer:
(i) Ripening of fruits is a chemical change because after ripening, a new product with different properties is formed.

(ii) The rotation of fan is a periodic change, because the change occurs after a fixed interval of time.

(iii) Cooked food is spoiled by bacteria and microbes. To prevent food from spoiling, it is stored in refrigerator, where microbes are killed due to low temperature.

(iv) Iron sheet is coated with tin before making can, because tin coated sheets do not rust. It prevents iron sheet from rusting.

Question 2.
When is a change said to have taken place in a material? Explain with the help of an example.
Answer:
We have many things around us. All these things have certain properties such as state (solid, liquid or gas), position, shape, size, colour, temperature, composition and structure, etc. When one or more properties of a thing become different, we say that it has changed or a change has taken place. Changes involve different kinds of alternations in the things around us. When a change takes place, there may be a change in the state, position, shape,, size, colour, temperature, composition or structure of the material of the object. When ice melts, it forms water. Ice is a solid, whereas water is a liquid. So, the melting of ice involves a change in state (form solid to liquid state).

Question 3.
What is meant by reversible changes and irreversible changes? Explain with examples.
Answer:
Reversible change: A change which can be reversed to form the original substance is called a reversible change.
Example:
When we heat ice, it melts to form liquid water. A change from solid to liquid takes place during the melting of ice. Now, if we cool the water by keeping in the freezer of a refrigerator, it again changes into solid ice. So, the change from ice to water, by heating, has been reversed by cooling. Thus, the melting of ice to form water is reversible change.

Irreversible change : A change which cannot be reversed to form the original substance or substances is called irreversible change.

Example : If we burn a piece of paper, it changes into ash and smoke. Now, we cannot combine the ash and smoke to form the original piece of paper. So, the burning of paper is a change which cannot be reversed. Therefore, the burning of paper is an irreversible change.

Question 4.
Explain why, the burning of paper is said to be an irreversible change whereas the boiling of water is known as reversible change.
Answer:
If we burn a piece of paper, it changes into ash and smoke. Now, we cannot combine the ash and smoke to form the original piece of paper. So, the burning of paper is a change which cannot be reversed. Hence, the burning of paper is an irreversible change. When we boil water by heating, then it changes into steam. Now, if we cool the steam, then water is formed again. So, the changing of water into steam has been reversed by cooling. Thus, the boiling of water is a reversible change.

Changes Around Us Class 6 HBSE Notes

1. We can bring about a change in a substance by heating, applying forces or by mixing it with something else.

2. When a solid mix with water to form a solution and we can say that the solid has dissolved,

3. Different solids dissolve to different degrees in the same amount of water. On heating, amount of solid that can dissolve increases.

4. A change can be physical or chemical. In chemical change, a new product is formed. A physical change can reverse.

5. Slow changes : The changes that takes place over a long period of time, like hours, days, months and years is called slow change. Example : Change during growth and formation of manure.

6. Desirable changes : Changes which are useful to us such as formation of curd from milk and formation of manure from cow dung.

7. Undesirable changes: The changes which are not useful to us are called undesirable changes. Examples : Breaking of glass tumbler and spoiling of food stuffs.

8. Fast changes : Those changes which occur within a short time interval. Example : Burning of a matchstick.

9. Periodic change : A change which occurs during a definite time interval is called periodic change. Examples : Heart beat, phases of moon etc.

10. Non-periodic change: A change which does not repeat again and again after a regular interval of time. Examples : Earthquake and train accidents.

11. Reversible change : If a change can be reversed, it is called reversible change; stretching of rubber band.

12. Irreversible change : A change which cannot be reversed. Example : Burning of paper, etc.

13. Physical change : It is a temporary change in which no new substance is formed. Example : Switching of electric heater. Dissolution of sugar in water.

14. Chemical change: It is a permanent change in which an entirely hew substance is formed with different properties. It is an irreversible change.
Example: Cooking of food and formation of curd from milk.

15. There are a variety of objects found in the surroundings. The objects have a variety of shapes and size. Shape and size of each object indicate the space it occupies.

16. Objects observed around us in spite of variety in shape and size are made up of matter. Some are categorised as living while others are non-living.

17. All living things need food to carry out various activities. Food provides energy for various functions.

18. Green plants prepare their own food by using water and minerals (from soil) carbon dioxide (from air) and sunlight with the help of green pigments. Unlike plants, animals take food in the form of plants/animal products.

19. The living things may be autotrophs or heterotrophs depending upon their mode of feedings.

20. Animals do breathing and respiration. In plant respiration involves direct exchanges of gases between air and cells. Non-living objects do not carry out respirations.

21. Respiration is a process which involves exchanges of gases like oxygen and carbon dioxide.

22. All living things remove wastes like carbon dioxide, water and other salts. Animals remove wastes through excretory organs.

23. Plants secrete wastes as gum, resin, latex. Non-living objects like stone, chair etc. do not remove wastes.

24. When living things increase in size utilizing energy, it is called growth. They grow for a certain period called life span and show growth for a limiting period.

25. Plants keeps growing throughout their lives. Some trees grow for hundred of years. Non-living things do not show the process of growth.

26. Living things show response to stimuli through factors like water, light, gravity, touch etc; while non-living things do not show such mechanism of responding to stimuli.

27. All living organisms produce their own kind, as mango will produce mango, cat will produce cat and man will produce man.

28. Reproduction in living organisms is multiplication of organism and non-living organism like stone and chair do not reproduce.

29. Living organisms show movements and locomotion. All living being are made up of basic functional units called cells.

Haryana State Board HBSE 6th Class Science Solutions Chapter 5 Separation of Substances Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 5 Separation of Substances

HBSE 6th Class Science Separation of Substances Textbook Questions and Answers

Exercises

Question 1.
Why do we need to separate different substances present in a mixture? Give two examples.
Answer:
We need to separate different substances present in a mixture due to the following purposes:

• To remove the unuseful or harmful components for example removing tea leaves after making tea.
• To obtain the useful components – for getting wheat or rice grains after separating.
• To remove impurities for getting a pure sample. For example obtaining sugar crystals from jaggery (Gur) or salt from sea water.

Examples:

• Tea leaves age separated from liquid with a strainer while preparing tea.
• Grain is separated from stalks, while harvesting.

Question 2.
What is winnowing? Where is it used?
Answer:
The process of separating lighter and heavier particles from a mixture is called winnowing. In this process/method heavier particles of grains are separated from lighter particles of husk. The husk particles are carried away by wind and separate heap away from that of the heavier particles of grains of wheat is formed. This method is used by farmers in fields as well as at a flour mill (atta chakki).

Question 3.
How will you separate husk or dirt particles from pulses before cooking?
Answer:
The husk particles or dust particles are separated from pulses by the method of hand picking. Since the undesired particles are present in small quantities and the total amount of pulses to be separated is generally not very- very large. So they are separated by hand picking before cooking the pulses.

Question 4.
What is sieving? Where it is used?
Answer:
Sieving is a method used to separate the components of a mixture which are of different size. The undesirable particles in the form of husk remain on the seive and fine particles of flour pass through the holes of the sieve. Sieving flour before consuming is not a good practice, because during sieving husk remains on the seive, which provides us roughage which is useful for our body.

Question 5.
How will you seperate sand and water from their mixture?
Answer:
A mixture of sand and water can be separated by decantation method. Take a glass tumbler half filled with the given sample of water. Stir the water thoroughly. Now keep the tumbler undisturbed for sometime. We must see that sand being heavier than water has settled down at the bottom of the tumbler. This process is sedimentation. Now pour the. clear water into another tumbler, without disturbing the layer of sand and with the help of a glass rod. This process is decantation. In this way, mixture of sand and water can be separated.

Question 6.
Is it possible to separate sugar mixed with wheat flour? If yes, how will you do it?
Answer:
Yes, it is possible to separate sugar mixed with wheat flour. The mixture of sugar & wheat flour can be separated by sieving. The wheat fine particles separates by strainer and sugar particles being bigger in size remains on the strainer. Thus sugar can be separated from the mixture of sugar and wheat flour.

Question 7.
How would you obtain clear water from a sample of muddy water?
Answer:
We can separate clear water from muddy water by loading process. Take a beaker half filled with muddy water and take a piece of alum. Tie the alum piece by a cotton thread.

Now dip the alum in water and move it slowly in a circular path for about one minute. Remove the alum and keep the beaker undisturbed for a few minutes. We find that dust particles that are responsible for making the water muddy settle down readily. Alum dissolves in water very easily. The fine dust particles get loaded and become heavier and settle down at the bottom of the beaker. The clear water may be decanted. This activity combines two methods loading and decantation.

Question 8.
Fill up the blanks :
(a) The method, of separating seeds of paddy from its stalk is called ________.
(b) When milk is poured onto a piece of cloth the cream(malai) is left behind on it. This process of separating cream from milk is an example of ________.
(c) Salt is obtained from sea water by the process of ________.
(d) Impurities settled at the bottom when muddy water was kept over night in a bucket. The clear water was then poured of from the top. The process of separation used in this example is called ________
Answer:
(a) Winnowing
(b) filtration
(c) Evaporation
(d) Decantation.

Question 9.
True or False?
(a) A mixture of milk and water can be separated by filtration.
(b) A mixture of powdered salt and sugar can be separated by the proces of winnowing.
(c) Separation of sugar from tea can be done with filtration.
(d) Grain and husk can be separated with ‘ the process of decantation.
Answer:
(a) False
(b) False
(c) False
(d)True.

Question 10.
Lemonade is prepared by mixing lemon juice and sugar in water. You wish j to ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which cash would it be possible to dissolve more sugar?
Answer:
We should add ice in lemonade after dissolving sugar in it, because sugar dissolve more before adding ice. It would be possible to dissolve more sugar before adding ice in the lemonade, because it dissolve more into hot than in cold.

HBSE 6th Class Science Separation of Substances Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What is a pure substance?
Answer:
A pure substance is one that consists of a single element or compound.

Question 2.
How will you separate a mixture of iron fillings and sulphur powder?
Answer:
The mixture can be separated by using a magnet. The iron fillings are picked out by the magnet and sulphur powder remains behind.

Question 3.
Name the method used to separate butter from milk.
Answer:
Centrifugation/churning method.

Question 4.
Name two materials used as filters.
Answer:

• Cotton cloth
• Filter paper.

Question 5.
Which method will you use to separate blue vitriol (Neela thotha) from its solution?
Answer:
Crystalization method.

Question 6.
What is meant by the term ‘mixture’?
Answer:
A mixture is a substance made up of two or more elements or compounds, physically mixed in any ratio.

Question 7.
Give three examples of mixture.
Answer:
Tea, milk and air.

Question 8.
Write two properties of mixtures.
Answer:

• Ratio of constituents is not fixed.
• Does not have definite m.p. or b.p.

Question 9.
Name the process of obtaining ; iron from waste materials.
Answer:
Magnetic separation.

Question 10.
How can you obtain distilled water?
Answer:
By distillation process.

Question 11.
Name the process to separate two immiscible liquids.
Answer:
Decantation process by separating funnel.

Question 12.
Name a gaseous mixture.
Answer:
Air.

Question 13.
Name three mixtures found in nature.
Answer:

• Sea water/pond water/lake water.
• Air

Question 14.
What is winnowing?
Answer:
It is the process of separation of grains from husk and hay with the help of wind.

Question 15.
What is centrifugation?
Answer:
It is a method of separating suspended solid particles from a liquid.

Question 16.
Name the method of separating two immiscible liquids.
Answer:
Decantation or By separating funnel.

Question 17.
What is sublimation?
Answer:
It is a process in which a solid gets converted into its gaseous state.

Question 18.
What is loading?
Answer:
The process of setling down solid particles quickly.

Question 19.
What is churning?
Answer:
Churning is a method of making butter.

Short Answer Type Questions

Question 1.
What is a mixture? Give two examples.
Answer:
A mixture is a substance made up of two or more elements or compounds, when physically mixed in any ratio.
(i) Gun powder (ii) Salt in water.

Question 2.
How will you prepare a big crystal of sugar from powdered sugar?
Answer:
Prepare sugar solution in hot water and allow it to cool. Filter the solution. Now hang a crystal of sugar with the help of a thread and a glass rod leave the solution undisturbed for four days. Now we see that crystals slowly begin to grow on the crystal.

Question 3.
How is common salt obtained from sea water?
Answer:
Sea water is run into shadow ponds and allowed to evaporate to dryness in hot sun. Water evaporates and solid common salt is left behind. The salt is then collected in heaps.

Question 4.
How will you separate a mixture of sulphur in water?
Answer:
Take the mixture of water and sulphur in a beaker. Pour the mixture on the filter paper with the help of a glass rod so that the liquid stands below the edge of the cone. The residue that remains on the filter paper is sulphur. Now dry it to get sulphur and water is collected in beaker.

Question 5.
How will you separate a mixture of naphthalene and salt?
Answer:
Naphthalene and salt mixture can be separated by the process of sublimation. Naphthalene sublimates and is collected on inverted keep and salt remains behind in the dish.

Question 6.
What do you mean by decantation? What are its uses?
Answer:
Decantation is a process by which we can remove a liquid without disturbing the solid settled down in the bottom.
Uses: This method can be used to separate a mixture of

• sand and water
• mixture of two liquids – water and oil.

Question 7.
How will you separate a mixture of water and kerosene oil?
Answer:
Mixture of kerosene oil and water can be separated by using separating funnel. Take the mixture in separating funnel and allow it to stand for some time. After sometime, two different layers form. Kerosene oil being lighter forms upper layer and water forms lower layer. By opening the stop cock, we obtain water and kerosene remains on the funnel.

Question 8.
What do you mean by distillation? How can you separate a mixture of alcohol and water?
Answer:
Distillation is the process in which liquid is heated to get vapours and then cooling the various to get back liquids. It is used to separate a mixture the components of which have different boiling points.

The mixture of alcohol and water is taken in a round bottom flask. Alcohol boiling point 80°C, evaporates first on heating as compared to water with boiling point 100°C. Now alcohol vapours are condensed by cooling in a separate container. It gets converted back to alcohol liquid and water remains in flask.

Question 9.
How will you separate a mixture of iron dust and sulphur powder?
Answer:
A mixture of iron dust and sulphur can be separated by the magnetic separation method. Iron dust is attracted towards the magnet and separated in a container and sulphur remains behind in the container.

Question 10.
How will you separate a mixture of iodine and sand?
Answer:
A mixture of iodine and sand can be separated by sublimation. The mixture is taken into a china dish and covered with inverted funnel. A cotton plug prevents the vapours from escaping into atmosphere. On heating, iodine sublime and collected on the cool inner surface of funnel. Sand is left behind in the disc.

Long Answer Type Questions

Question 1.
How will you separate a mixture of iron fillings, common salt, sand and sulphur?
Answer:
Iron fillings are separated from the mixture by using a magnet. The remaining mixture of salt,-sand and sulphur is stirred with water when salt is dissolved in it. On filtration salt solution is obtained as a filtrate and the residue contains sand and sulphur.

Sand and sulphur mixture is shaken with carbon disulphide, when sulphur dissolves in it but sand remains undissolved. On filtration, sand is obtained as residue and sulphur as filtrate. On evaporating the filtrate carbon disulphide is removed and sulphur is obtained.

Question 2.
How you will purify common salt obtained from sea water?
Answer:
The lumps of impure common salt obtained from sea water, are crushed to get powdered salt. The powdered common salt is dissolved in water to prepare a solution. The solution of common salt is filtered to remove insoluble impurities.

The clear solution of common salt is evaporated by heating to remove some of the water to obtain a concentrated solution. The hot concentrated solution of common salt is allowed to cool. On cooling, the hot solution crystallises and crystals of pure common salt are obtained.

Separation of Substances Class 6 HBSE Note

1. We use some materials like sugar, common salt, water, milk as such in our daily life. In many materials, we have to separate the useful components from the unwanted or sometimes harmful components before we can use them. For example we peel off the skins of mangoes and bananas before using them.

2. Pure substances : A pure substance is one that consists of a single element or compound. All its constituents have similar properties. Examples are copper, iron, water, common salt, sugar etc.

3. Mixtures : A mixture contains two or more types of constituents which are present in any ratio. For example, air around us contains many gases such as nitrogen, oxygen, carbon dioxide and dust particles. Thus air is a mixture. Sea water, pond and river water are also mixtures. Gun powder and brass are other examples of mixtures.

4. Need for separation : We know that a mixture contains two or more components. We want to be very sure about the purity of the food we take in. Even the water we drink should be pure. We can say that we carry out the separation of substances with the following purposes:

• To remove the un-useful or harmful component.
• To obtain the useful component.
• To remove impurities for getting a pure sample.

5. Principle of separation : Different materials have different properties and we can use these property differences to separate mixtures. The components of a mixture can be separated by one method or by a combination of various methods.

6. Method of separation : Often, in mixtures, we are able to see the different components present. There are several methods used for separating the constituents of a mixture. The choice of the method used depends upon the nature or the properties of the constituents. Some common methods for the separation of the components of a mixture are as follows :

7. Hand Picking: This method is use for separating small particles of dust, stone, husk etc. from the grains of wheat, rice and pulses etc. Since these unwanted components are present in small quantities and total amount of grains to be separated is not very-very large, so they are separated by hand picking.

8. Sieving: Sieving of wheat flour (atta) is a common practice. Sieving a wheat flour through a sieve allows fine particles of the flour to pass through the holes of the sieve while the bigger husk particles remain on the sieve.

Sieving is used when two components of a mixture have different sizes. Sand can be separated from stone by seiving.

9. Winnowing : This method of separation is commonly used to separate lighter particles from heavier grains of wheat.

In this method, the wheat grains containing husk are allowed to fall down from some height while the wind is blowing. Since husk is lighter than grains, it gets carried away by wind and heaps of grains and husk are formed separately.

10. Sedimentation and decantation : This method of separation is used for a mixture consisting of an insoluble solid and a liquid. The process of settling down of heavier insoluble particles in a mixture of water and insoluble substances is called sedimentation (Fig 5.5). The process of transferring the clear liquid (after sedimentation) without disturbing the sedimentation insoluble heavy particles is called decantation. Fig. 5.5. (6).

Decantation can also be used for separating two immiscible liquids such as oil and mixture. Oil and water do not mix with each other and form separate layers. They can also be separated by using separating funnel.

11. Loading : In rainy season we get muddy water from wells, taps or other sources of drinking water. This muddy water can be made clear by loading. If a piece of alum, tied

with a thread, is swirrled in such a water, then after some time the water becomes clear on standing. (Fig 5.7) The water becomes clear because the mud particles get loaded by the alum particles and become heavy and settle down at the bottom of the container and water can be decanted for further use.

12. Filtration : Filtration is used to separate solid impurities from a liquid. In our homes, tea is filtered to separate tea leaves and shikanji (lemo-nade) is filtered to separate the seeds of the lemon.

13. Evaporation : The process of separating any salt from its solution by removing water is called evaporation. This process is largely used to obtain common salt from sea water. When sea water is allowed to stand in shallow pits, water slowly turns into water vapours by absorbing the heat of the sun, leaving behind solid salt.

14. Magnetic separation : This process of separation is used when one of the components in the mixture is iron. For example a mixture of iron fillings and sand can 5.10. “Magnetic, separation”

be separated by moving a magnet in the mixture. The Magnet picks out only iron fillings from the sand. This process is called magnetic separation (Fig 5.10)

15. Churning: This process is used to separate cream from milk. When milk is churned for some time, the lighter cream particles float on its surface from where they can be separated. Churning can be done by hand or by using a mixi. (Fig 5.11.)

16. When one method of separation is not sufficient to separate the different substances present in a mixture, we use more than one methods. (See Fig 5.13) For example if we have a mixture of salt, water and sand and we want to separate all the three substances, we use two methods-decantation and evaporation.

Haryana State Board HBSE 6th Class Science Solutions Chapter 4 Sorting Materials Into Groups Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 4 Sorting Materials Into Groups

HBSE 6th Class Science Sorting Materials Into Groups Textbook Questions and Answers

Exercises

Question 1.
Name five objects which can be made from wood.
Answer:
Objects which can be made from wood are:

• Chair
• Table
• Desk
• Double bed
• Stool
• Almirah.

Question 2.
Select those objects from the following which shine :
Glass bowl, plastic toy, steel spoon, cotton shirt.
Answer:
Glass bowl, steel spoon.

Question 3.
Match the following things with the materials from which they are made :

Answer:
(i) paper
(ii) glass
(iii) wood
(iv) plastics
(v) leather.

Question 4.
State whether the statements given below are true or false :
(i) Stone is transparent, while glass is opaque.
(ii) A note book has lustre while eraser does not.
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.
Answer:
(i) False
(ii) False
(iii) True
(iv) True
(v) False
(vi) False
(vii) True
(viii) True.

Question 5.
Given below are the names of some objects and materials :
Water, basket ball, orange, sugar, globe, apple and earthen pitcher
Group them as :
(a) Round shaped and other shape.
(b) Eatables and non-etables.
Answer:
Round-shaped object Other-shaped objects

• Basket ball
• Water
• Orange
• Sugar
• Globe
• Apple
• Earthen pitcher.

Question 6.
List all items known to you that float on water. Check and see if they will float on a oil or kerosene.
Answer:

• Dried leaves
• paper
• wax
• ice
• oil.

All these materials floats on water and they sink in oil and float on kerosene.

Question 7.
Find the odd one out from the following:
(a) Chair, Bed, Table, Baby, Cup-board.
(b) Rose, Jasmine, Boat, Marigold, Lotus.
(c) Aluminium, Iron, Copper, Silver, Sand.
(d) Sugar, Salt, Sand, Milk, Milk powder.
Answer:
(a) Baby
(b) Boat
(c) Sand
(d) Milk

HBSE 6th Class Science Sorting Materials into Groups Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What do you mean by classification?
Answer:
The process of grouping things on the basis of some common properties is called classification.

Question 2.
How groupings of things are made?
Answer:
Goupings of things are done according to some similarities, necessities, and convenience to make it easier to work with them.

Question 3.
Name three things made from glass.
Answer:
Bowl, bottle, jug, katori.

Question 4.
Name two materials which are soluble in water.
Answer:

• Salt
• sugar.

Question 5.
Name five objects which are made from transparent materials.
Answer:

• Glass bowl
• Glass bottles
• Window pan
• Looking glass
• Pen.

Question 6.
List three liquids which are transparent.
Answer:

• Water
• Spirit
• Benzene.

Question 7.
List five objects which are made from opaque materials.
Answer:

• Table
• Chair
• Door
• Bed
• Black board.

Question 8.
What is common between salt and sand?
Answer:
Mass.

Question 9.
Name three bad conductors of heat.
Answer:

• Wood
• Rubber
• Paper.

Question 10.
Name three good conductors of heat.
Answer:
Aluminium, copper and iron.

Question 11.
Name five magnetic objects.
Answer:
Eraser, Pins, Iron nails, Scissors and steel spoon.

Question 12.
Name two objects made from plastics.
Answer:

• Mug
• Toys.

Question 13.
Name two substances which are insoluble in water.
Answer:

• Chalk
• Plaster.

Question 14.
Name four metals which are used in our daily life.
Answer:

• Aluminium
• Copper
• Brass
• Iron.

Question 15.
Write two properties of metals.
Answer:

• They look shining in appearance.
• Metals are good conductors of heat.

Question 16.
Name three liquids which are immiscible in water.
Answer:

• Mustard oil
• Glycerine
• Coconut oil.

Question 17.
Name three materials which float in water.
Answer:

• Wax
• wood
• ice.

Question 18.
Name three things which are non-magnetic.
Answer:

• Rubber
• Chalk
• Plastics
• Wood.

Question 19.
How can materials be grouped?
Answer:
Materials can be grouped on the basis of similarities and differences in their properties.

Question 20.
Name some combustible materials.
Answer:
Wood, paper and cotton.

Question 21.
Which are translucent materials?
Answer:
The materials through which things are only partially visible are called translucent materials.

Short Answer Type Questions

Question 1.
What are objects made of?
Answer:

• An object can be made from different materials. For example, your shoes can be made of canvas, leather, rubber or plastics.
• Different objects can be made from the same material. For example, flower vase, window panes, glass jar, fish aquarium are made from the same material.
• An object or a thing can be made using more than one material. For example, idli is made of rice, urad dal, salt and water.

Question 2.
Mention three properties of materials.
Answer:
Three important properties of materials are described below :

• Physical State : All materials can be classified as solid, liquid and gas. We cannot see gases but we can feel their presence.
• Appearance : Any material can be described in terms of its colour, lustre, texture or hardness.
• Solubility : All materials can be soluble or insoluble in water. For example, sugar is soluble in water but sand is insoluble in water. Liquid and gases may also be soluble or insoluble in water.

Question 3.
Write three common characteristics of materials.
Answer:

• All materials can be felt by one or more of our senses.
• All materials occupy space.
• All materials possess mass.

Question 4.
Why are handles of utensils made from wood or plastics?
Answer:
The handles of utensils are made from wood or plastics because utensils are good conductors of heat and wood and plastics are bad conductors of heat. They do not allow the heat transmission through them. So the handles of utensils are made from wood or plastics so that we do not burn our hands while handling these utensils when they are hot.

Question 5.
Name two gases which are soluble and two gases which are insoluble. What is the importance of gases dissolved in water?
Answer:
→ Gases which are soluble in water: Oxygen and Carbon dioxide.

→ Gases which are insoluble in water: Hydrogen, Nitrogen.
The oxygen dissolved in water helps aquatic plants and animals. Carbon dioxide dissolved in water helps the plants living in water for photosynthesis.

Question 6.
X, Y and Z are three types of materials. The materials X and Y can break into pieces easily when hit with an object but material Z does not break easily. The material X is used in the windows of bathrooms in our house whereas material Y is used in the windows of our drawing room. The material Z is used in making doors and almirahs in our house.
(a) What do you think material X could be? What is the general name of materials liheX?
(b) What could material Y be? Write the general name of materials like Y.
(c) What could material Z be? What is the general name of material like Z?
Answer:
(a) Ground glass : Translucent materials
(b) Clear glass: Transparent materials
(c) Wood : Opaque Materials.

Question 7.
Why cotton floats on water?
Answer:
Cotton has large number of pores in it. The air gets trapped in it thereby reducing its density (by increasing the volume of cotton by air). Therefore cotton floats on water. But when these pores get filled with water it starts sinking.

Question 8.
A few things have been grouped as follows. Identify the property common to all things in each group.
Group – I : Glass, Cup, Bucket, Mug, Jug
Group – II : Man, Cow, Camel
Group – III : Copper, Iron, Silver, Gold
Answer:
Group – I: Containers – all are made of plastic/steel.
Group – II: Living beings-all are mammals.
Group – III : All are metals.

Question 9.
Which among kerosene and glycerine is miscible in water? How will you find out?
Answer:
Glycerine is miscible in water.
Take some water in two test tubes. Put a few drops of glycerine into one test tube and a few drops of kerosene into the other. Shake them well. Glycerine mixes with water and cannot be seen separately. Kerosene does not mix with water. It can be seen as a separate layer on the top of water.

Question 10.
Give an activity to observe flow of heat in metal and wood.
Answer:
Take a cup and fill it partly with hot water. Place two spoons in it – one made of aluminium and the other made of wood. After a minute, touch the upper top of each spoon. You will observe that the aluminium spoon is hotter than the wooden spoon. This is because heat can flow quickly through aluminium but not so in wood.

Long Answer Type Questions

Question 1.
What are the advantages of classification/grouping things or materials?
Answer:
The advantages of classification/ grouping of things or materials are as under:

• Classification helps to understand similarities and dissimilarities among the objects.
• Classification helps location of things. It is only because of classification that you are able to locate a book that you need out of thousands in your school library.
• Classification of objects helps their identification.
• Classification makes study of different objects easy and more meaningful. Rather than studying each object separately, we can study just one out of each class of different objects and generalize our results for the class as a whole.
• Classification helps us to know the material of which the object is formed.

Question 2.
List the characteristics of solids, liquids and gases and give an example of each.
Answer:
Solids : All solids have the following characteristics :

• They have a definite shape and volume.
• They cannot be compressed easily.
• The particles they are made of are packed very tightly.

Examples : Gold and wood.
Liquids : All liquids have the following characteristics:

• They have a definite volume but no definite shape. They take the shape of the container they are poured in.
• They can be compressed more easily than solids.
• The particles they are made up of are not so tightly packed as in solids.

Examples : Water and alcohol.
Gases : All gases have the following characteristics:

• They have no definite shape or volume.
• They can be compressed very easily.
• The particles they are made up of are packed loosely.

Examples : Oxygen and Carbon dioxide.

Question 3.
Discuss important properties of matter. (Any five)
Answer:
Some important properties of matter are discussed below:

• Appearance: Materials (or matter) can be classified on the basis of their appearance. Different materials have different appearances.
• Lustre : Materials can be classified on the basis of their lustre. Some shine a lot whereas others are quite dull.
• Texture : Different materials feel different when touched, so they have different textures.
• State: Most materials can be placed into one of the three groups : Solid, liquid or gas.
• Solubility in water: Some substances are soluble in water, others are insoluble. Miscible liquids mix with each other, immiscible liquids do not.

Sorting Materials into Groups Class 6 HBSE Notes

1. There is a large variety of things around us, some of familiar furniture may be chairs, tables, almirah, utensils, books, clothes, toys, television, refrigerator and other household items.

2. Different things can be used for making different types of materials.

3. Different types of materials have different properties such as appearance, solubility, transparency, conductivity and behaviour towards magnets etc.

4. Things can be grouped on the basis of their properties of materials from which they are made. Similar things are arranged together for convenience.

5. Materials which have lustre are called metals. Iron, copper, aluminium and gold are some examples of metals. Thus metals have a lustre and are called lustrous materials.

6. The surface of a material could be smooth or rough. Such as a stone feels rough on touching and metal surfaces are smooth to touch.

7. Materials may be hard or soft. Materials which are difficult to press are called hard and which can be pressed easily are called soft.

8. Substances which dissolve in water are called soluble and which remain the same are called insoluble.

9. Those liquids which mix well with water are said to be miscible and others which do not mix well are known as immiscible in water.

10. Some gases are soluble in water such as oxygen gas which dissolves in water is very important for the survival of aquatic animals.

11. Some materials like sand, sugar and salt sink in water and such materials like wax and oils float on water.

12. Materials may be transparent, opaque and translucent. Materials through which things can be seen are called transparent and materials through which you things are not able to see are called opaque and materials through which things are only partially visible; are called translucent.

13. Those materials/substances which allow the transmission of heat through them are called conductors of heat, which do not allow heat to pass through them are called non-conductors or poor conductors.

14. All metals are conductors of heat. Wood, plastics and a piece of cotton are examples of non-conductors. Gases are poor conductors of heat.

15. Some materials which burn on direct flame in the presence of air, are called combustible materials.

16. Materials which get strongly attracted towards the magnet are called magnetic materials. Our earth itself is a huge magnet. Magnetic materials find many uses in electronic devices.

17. Things are grouped together on the basis of properties of materials from which they are made.

18. The tendency of substances to intermix is called diffusion.

Haryana State Board HBSE 6th Class Science Solutions Chapter 3 Fibre to Fabric Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 3 Fibre to Fabric

HBSE 6th Class Science Fibre to Fabric Textbook Questions and Answers

Exercises

Question 1.
Classify the following fibres as natural or synthetic:
Nylon, wool, cotton, silk, polyester, jute.
Answer:

• Natural fibres : Wool, cotton, silk, jute.
• Synthetic fibres : Nylon, polyester.

Question 2.
State whether the following statements are true or false :
(a) Yarn is made from fibres.
(b) Spinning is a process of making fibres.
(c) Jute is the outer covering of coconut.
(d) The process of removingseed from cotton is called ginning.
(e) Weaving ofyaf’n make a piece of fabric.
(f) Silk fibre is obtained from the stem of plants.
(g) Polyester is a natural fibre.
Answer:
(a) True
(b) True
(c) False
(d) True
(e) True
(f) False
(g) False

Question 3.
Fill in the blanks :
(a) Plant fibres are obtained from ________ and ________.
(b) Animal fibres are ________ and ________.
Answer:
(a) Cotton, jute
(b) Wool, silk.

Question 4.
From which part of plant cotton and jute are obtained?
Answer:
Cotton fibres are obtained from cotton seeds. They are hairs of cotton seeds. Jute fibres are obtained from the stem of jute plants by retting process.

Question 5.
Name two items that are made from coconut fibres.
Answer:

• Ropes
• Coir in mattress.

Question 6.
Explain the process of making yarn from fibres.
Answer:
The process of making yam from fibres is called spinning. In this process fibres from a mass of cotton wool are drawn out and twisted. This brings the fibres together to form a yarn.

A simple device used for spinning is a hand spindle also called takli and charkha. Spinning of yarn on a large scale is done with the help of spinning machine. After spinning yams are used for making fabrics.

HBSE 6th Class Science Fibre to Fabric Important Questions and Answers

Very Short Answer Type Questions

Question 1.
Name some fibres obtained from natural sources (Plants/animals).
Answer:
Cotton, silk, wool and jute fibres are obtained from natural sources.

Question 2.
Name two fibres obtained from man-made materials.
Answer:
Nylon and polyester.

Question 3.
Which type of clothes absorb water quickly?
Answer:
Cotton clothes absorb water quickly.

Question 4.
Which type of clothes bum quickly?
Answer:
Nylon and polyester clothes bum quickly.

Question 5.
From where do we get wool and silk?
Answer:
We get wool from animal hairs (sheep) and silk from silk worm.

Question 6.
From which time cotton has been used in India?
Answer:
In India cotton has been used since 1800 B.C.

Question 7.
Where is cotton grown in India?
Answer:
In India cotton crops are grown in Maharashtra, Gujarat, Punjab, Rajasthan, Tamilnadu and Madhya Pradesh.

Question 8.
In which climate are cotton crops grown?
Answer:
Cotton crop needs warm climate.

Question 9.
Write two uses of cotton.
Answer:

• Manufacture of textiles.
• As absorbent in hospitals.

Question 10.
Where do we get jute?
Answer:
Jute is obtained from stem of jute plants in the form of patsun.

Question 11.
How are jute fibres used?
Answer:
Jute fibres are used for making gunny bags, carpets and curtains.

Question 12.
Why did primitive life need no cloth?
Answer:
Because they lived mostly to tropics where the climate was warm.

Question 13.
Why are cotton and woollen fibres rough?
Answer:
Cotton and woollen fibres are rough because they have many folds and uneven surface on it.

Question 14.
Why are nylon and polyester fibres smooth?
Answer:
Nylon and polyester fibres are smooth because they have long plain, fine structure.

Question 15.
Why are fibres twisted?
Answer:
By twisting fibres, they become strong and their cohesion power increases.

Question 16.
Name some natural and man-made cloth materials.
Answer:
Natural cloth materials are : cotton, wool, silk and jute etc.
Man-made cloth materials are: rayon, nylon and polyesters etc.

Short Answer Type Questions

Question 1.
From where do we get materials used for making clothes?
Answer:
We get materials used for making clothes from natural sources such as cotton, jute, silk and wool from plants and animals and from man-made/artificial sources such as nylon, polyester and rayon etc.

Question 2.
Where do the plants have fibres in their body?
Answer:
Plants have fibres in their body in different parts. For examples; cotton and mango have fibres on their seeds, coconut on its fruits, jute on its stem and banana tree on its leaf.

Question 3.
From where do we get wool and silk fibres?
Answer:
Wool and silk fibres are obtained from animals. Wool is obtained from hair of animals; as sheep hairs and silk fibres are obtained from silk worm.

Question 4.
Where are cotton crops grown?
Answer:
Cotton crops are grown in black soil, which is best for of cultivation of cotton crops. It is planted early in the spring season. It needs warm climate. Its plant grows steadily and soon becomes brushes of 3 to 5 feet height.

Question 5.
What are the various uses of cotton?
Answer:
Cotton is used as follows :

• Cotton or cotton in combination with other fibres is used in manufacture of textiles.
• Cleaned cotton is used as absorbent in hospitals.
• Unspun cotton is used as fillers in mattresses, pillows and quilts.
• It is used as raw materials for manufacture of rayon and paper industry.

Question 6.
Where and when is jute cultivated?
Answer:
Jute is cultivated in alluvial soils in the delta region of rivers like Ganga and Brahmaputra. In India jute is mainly grown in West Bengal, Bihar and Assam. It is cultivated during rainy season.

Question 7.
How was clothing developed?
Answer:
Cloth making was developed in three stages: (i) First stage was making cloth from plant fibres, (ii) Second stage was the beginning the use of animal fibres and the third stage began with man-made fibres in 19th century.

Question 8.
Why do we wear clothes?
Answer:
We wear clothes due to the following reasons:

• They protect against wind and weather.
• They protect against injury.
• They maintain body heat.

Question 9.
Why is it necessary to make yarn from fabrics for making clothes?
Answer:
Cotton, wool and silk fibres are suitable for making yarn. For making yarn, fibres are twisted. Twisting of fibres into yarn increases the cohesion (togetherness) and strength of fibres.

Long Answer Type Questions

Question 1.
How do we obtain jute fibres from jute plants?
Answer:
On complete maturation of plants, fibres on its stem becomes very hard. The cut plants are grouped at different places in the field for a few days when most of the leaves fall down. The plants now are tied in small bundles and these bundles made to sink in stagnant water of pond for a few days when the gummy spin rots out to separate fibres. The process is called retting. Fibre is extracted from the retted jute by hand, with jerk and pulls. The dry fibres are then tied together in small bundles. They are pale yellow jn colour with 6 to 8 feet length and quite strong with silky lustre. They can easily be spun into fabrics.

Question 2.
Give a brief account of the journey of jute from its cultivation to making the fibre.
Answer:
(i) Jute is grown in alluvial soil in the delta region of the Ganga and Brahmaputra rivers.

(ii) Jute is cultivated during the rainy season. It bears yellow flowers in 3-4 months.

(iii) Jute plants are usually cut at the flowering state. A good quality fibre is obtained from plants cut at the flowering state. Jute obtained from a matured plant is harder.

(iv) After the dry leaves haven fallen, the bundles of dry plants are kept in a pond for a few days. During this period, the gummy skin rots out to separate the fibres. This process is called retting.

(v) The jute fibre is obtained from the retted jute by hand.

Fibre to Fabric Class 6 HBSE Notes

• We know that clothes we wear come from fibres. Clothes protect us from adverse weather condition.
• Materials used for making clothes are obtained from natural as well as man-made sources.
• Natural clothing materials includes cotton, wool, silk and jute.
• Man-made clothing materials are rayon, nylon and polyester etc.
• Different clothing materials have different properties. Cotton and wool are rough while rayon, silk, nylon and polyester are smooth to touch.
• All cloth materials are made up of long, narrow, thin structures called fibres. All the plants have fibres in their body structure.
• Cotton and mango have fibre in their seed, coconut in their fruits and jute in its stem and banana tree on its leaf.
• Cotton fibres are obtained from the seeds of cotton plant and jute fibres are obtained from the stem of jute plant by the process of retting.
• The process of pulled out cotton seeds from cotton is called ginning.
• Cotton fibres are used in manufacturing of textiles, as adsorbent in hospitals, as fillers in mattresses, pillows and quilts and raw materials for rayon.
• Jute fibres are obtained from the stem of plant called “patsun”. Its separation from stem is called retting.
• They are 6-8 feet length. It is used for making gunny bags, potato/sacks, carpets, curtains and ropes etc.
• Man-made fibres combined with other animal and plant fibres are used for making clothes for improved strength, wearing ability and other qualities.
• Clothes are necessary because they protect us from wind and weather, injury and maintains body heat.
• Clothes are made from threads and threads in turn are spun from fibres. Cotton, wool, silk and nylon are composed of very fine hair-like structures called fibres.
• Coconut fibres are used for making ropes or as coir mattresses. Soft and long fibres like cotton and wool are suitable to make yarn. Fibres cannot be used for making clothes directly.

Haryana State Board HBSE 6th Class Science Solutions Chapter 2 Components of Food Textbook Exercise Questions and Answers.

Haryana Board 6th Class Science Solutions Chapter 2 Components of Food

HBSE 6th Class Science Components of Food Textbook Questions and Answers

Exercises

Question 1.
Name the major nutrients in our food.
Answer:
The major nutrients in our food are:

• Carbohydrates
• Proteins
• Fats
• Vitamins
• Minerals
• Dietary fibres and water.

Question 2.
Name the following :
(a) The nutrients which mainly gives energy to our body.
(b) The nutrients that are needed for the growth and maintenance of our body.
(c) A vitamin required for maintaining good eye sight.
(d) A mineral that is required for keeping our bones healthy.
Answer:
(a) Carbohydrates and fats,
(b) Proteins
(c) Vitamins ‘A’
(d) Calcium.

Question 3.
Name two food each rich in :
(a) Fats
(b) Starch
(c) Dietary fibre
(d) Proteins.
Answer:
(a) (i) Butter, (ii) Ghee, (iii) Soyabean.
(b) (i) Rice (cooked), (ii) Dal (cooked), (iii) Peanuts.
(c) Whole grains and pulses. Fresh fruits.
(d) Milk, fish, cheese and eggs.

Question 4.
Tick (✓) the statements that are correct.
(a) By eating rice alone, we can fulfill nutritional requirement of our body. ( )
(b) Deficiency diseases can be prevented by eating a balanced diet. ( )
(c) Balance diet for the body should contain a variety of food items. ( )
(d) Meat alone is sufficient to provide all nutrients to the body. ( )
Answer:
(a) Not correct
(b) correct
(c) correct
(d) not correct.

Question 5.
Fill in the blanks :
(a) _________ is caused by deficiency of vitamin D.
(b) Deficiency of _________ causes a disease known as beri-beri.
(c) Deficiency of vitamin C causes a disease known as _________.
(d) Night blindness is caused due to deficiency of _________ in our food.
Answer:
(a) Rickets
(b) Vitamin B
(c) Scurvy
(d) Vitamin ‘A’.

HBSE 6th Class Science Components of Food Important Questions and Answers

Very Short Answer Type Questions

Question 1.
What are the essential nutrients for our body?
Answer:
Carbohydrates, proteins and fats, vitamins and minerals are essential nutrients.

Question 2.
Name any three sources of carbohydrates.
Answer:
Cereals – Sugar and sweet potato.

Question 3.
Name the disease caused due to lack of vitamin A.
Answer:
Night blindness.

Question 4.
Name two sources of animal proteins.
Answer:
Egg and milk.

Question 5.
Write two sources of plant protein.
Answer:
Pulses and beans.

Question 6.
Same mass of which nutrient gives more energy – Fats or carbohydrate?
Answer:
Fats.

Question 7.
Name two foods rich in dietary fibres.
Answer:

• cabbage
• spinach.

Question 8.
Name three foods rich in oil and fats.
Answer:
Butter, ghee, vegetable oils.

Question 9.
Name two protein-rich foods.
Answer:
Meat and milk.

Question 10.
Which food is needed for strong bones and teeth?
Answer:
Milk, fish, oils and eggs.

Question 11.
Which food is needed to prevent constipation?
Answer:
Juicy fruits and fresh vegetables.

Question 12.
Name the type of food which makes a balanced diet?
Answer:

• Energy-providing
• Growth- promoting
• protective food.

Question 13.
What are protective foods?
Answer:
Foods which help in protection of body from disease like – minerals and vitamins.

Question 14.
Name three sources of fats.
Answer:
Coconut, ghee and groundnut.

Question 15.
What is the importance of proper food selection?
Answer:
By selecting food properly, we can have nutritious diet in less price.

Question 16.
What are the sources of vitamin ‘D’?
Answer:
Milk, butter, egg and fish liver.

Question 17.
What is the causal factor of scurvy?
Answer:
It is caused by the deficiency of vitamin C.

Question 18.
What is the main cause of obesity?
Answer:
Excess eating of fried food is the main cause of obesity.

Question 19.
What are harmful effects of obesity?
Answer:
It causes heart disease, high blood pressure and diabetes.

Question 20.
Name four important minerals present in our body.
Answer:
Calcium, sodium, potassium and iron.
Calcium and phosphorus.

Question 21.
Name the disease caused by the deficiency of proteins and carbohydrates in children.
Answer:
Kwashiorkar and Marasmus.

Question 22.
Which disease is caused by the deficiency of vitamin B2?
Answer:
Retarded growth, Pellegra.

Question 23.
Name the disease caused by the deficiency of iron.
Answer:
Anaemia.

Question 24.
Name the disease caused by the deficiency of phosphorus.
Answer:
Body weakness and bad bones and teeth.

Question 25.
Chapatis of wheat flour or maida?
Answer:
Chapatis of wheat flour give us more nutrients.

Question 26.
Vegetables and fruits with peels or without peels?
Answer:
Vegetables and fruits with peels give us more nutrients.

Question 27.
Dalia or noodles?
Answer:
Dalia gives us more nutrients.

Question 28.
Fruit juice or created spot drinks?
Answer:
Fruits juice gives us more nutrients.

Short Answer Type Questions

Question 1.
What are the symptoms of vitamin ‘C’ deficiency?
Answer:
Symptoms of vitamin ‘C’ deficiency are :
(i) Skin on the gums begins to crack and bleed.
(ii) Wounds in the body take a longer time to heal.
(iii) Cough and cold are caused due to its deficiency.

Question 2.
What is the difference between vitamins and minerals?
Answer:
Difference between vitamins and minerals :

Question 3.
What is a balanced diet?
Answer:
A diet containing all the essential requirements in right proportion, necessary for the growth and development of the body. These are carbohydrates, fats, proteins, vitamins and minerals. Sufficient amount of water and roughage should also be present.

Question 4.
What are protective foods? Give two examples.
Answer:
Those foods which help in the protection of body against diseases like vitamins and minerals.

Question 5.
Name the different components of food.
Answer:
The main components of foods are : Carbohydrates, fats, proteins, vitamins and minerals. Roughage and water are also needed in proper quantity.

Question 6.
List the functions of food.
Answer:
Functions of foods are:

• To provide energy to do work.
• To help in repairing of injured body part and growth.
• To protect the body from infections and disease.

Question 7.
What is the importance of fats in our body?
Answer:
Fats are important for our body in the following ways:

• They are used as fuels in the absence of carbohydrates.
• Fats protect the internal organs from the external shocks.

Question 8.
Why is water essential for our life?
Answer:
Water is very essential for our body in the following ways :

• It acts as medium for body reactions and functions.
• It helps in transport of substances in the different parts of the body.
• It helps in digestion of food.
• It helps in removal of waste from the begins.
• It helps in maintaining the body tempture constant.

Question 9.
Why are vitamins and minerals called protective food?
Answer:
Minerals are chemical compounds needed in small quantities for proper growth and function of the body. Vitamins are also very important for proper functioning of the body organs. They protect our body from many diseases and infections. So they are called protective foods.

Question 10.
What is roughage? How is it important for the body?
Answer:
The part of food containing cellulose which is undigestible in nature acts as roughage. It helps in removing all the undigested food, stored in the digestive tracts, outside the body.

Question 11.
What is malnutrition? What are its harmful effects?
Answer:
Malnutrition is caused by deficiency of one or more nutrients in our diet. Protein deficiency causes kwashiorkar in which swelling in body occurs. Protein and carbohydrate deficiency cause marasmus in which leaves body parts leaning and person becomes thin.

Question 12.
What are the causal factors for scurvy and rickets?
Answer:
Scurvy is caused by the deficiency of vitamin ‘C’. In this disease, gums and nose start bleeding. The body bleeds inside. Rickets is caused by the deficiency of vitamin D. In this disease, bones become soft and bend.

Question 13.
Explain the following with suitable examples:
(i) Obesity, (ii) Hypervitaminosis, (iii) Anaemia.
Answer:
(i) Obesity : It is caused by excess eating of fried foods. Fats and carbohydrates are stored in our body and cause obesity. In it too much fats are deposited in the body which is very harmful.

(ii) Hypervitaminosis : It is caused due to excess of vitamin ‘D’. In hypervita-minosis the foot becomes like elephant and becomes very thick.

(iii) Anaemia : It is caused by the deficiency of iron. It is needed for the formation of red-blood cells in our blood. Therefore by the deficiency of iron our body becomes yellow. In this disease, there is a loss of appetite, nails becomes white, swelling appears on our hands and feet and other body parts.

Question 14.
What is the importance of carbohydrates in our body?
Answer:
Carbohydrates act as fuels in our body. It is the only nutrient which combusts frequently and produce energy. Our body use this energy in performing various body functions.

Question 15.
What is meant by P.E.M.? Name the disease caused by P.E.M.
Answer:
The elaborated form of P.E.M. is protein energy malnutrition. The diseases caused by P.E.M. are: (i) Kwashiorkar and (ii) Marasmus.

Question 16.
Explain the importance of proteins in the human body.
Answer:
Protein contains sufficient quantity of amino-acids to maintain a normal functioning of our body. It is required for growth and repairs in our body. It helps in building the new tissues. They also account for the tough fibrous nature of hair and nails. They are parts of our body and help in proper functioning of our body. It can also burn to provide energy in the time of emergency.

Question 17.
How would you test the presence of the following in the given food?
(a) Starch (b) Vitamin C.
Answer:
(a) Test for starch : The material is dissolved in water. To this solution, add some drops of iodine solution. If it turns blue, it shows the presence of starch.

(b) Test for vitamin C : The material is dissolved in water and add some drops of iodine solution in it. Now with the help of a dropper put drop by drop into the blue coloured iodine solution. If the blue colour disappears and brown colour appears, it shows the presence of vitamin C.

Question 18.
What happens when we eat lots of fried food?
Answer:
Fried foods such as noodles, pizza, burgers, potato wafers, chocolate, candies, ice-creams and soft drinks all are harmful to us if we take these in excess and regularly. These fast foods lack in minerals and vitamins. They cause obesity. They increase body weight.

Question 19.
Why do we have to drink lots of water?
Answer:
Water is required to perform several different functions. Our blood is mostly water. In dehydration, blood becomes thicker. Water helps in digestion. It dissolves waste products of the body and these could be removed through urine.

Long Answer Type Questions

Question 1.
What are vitamins? Write the sources of vitamin A, B, C and D. Name the disease caused due to the deficiency of these vitamins.
Answer:
Vitamins are a special group of compounds which are needed by our body only in very small quantities. They do not provide any energy to us, but they are essential components of our diet as they perform specific functions in our body. Some vitamins are water-soluble and some are fat-soluble. Vitamin ‘A’ is a fat-soluble vitamin. Its good sources are fish oil, milk, milk products and carrots. Its deficiency causes night blindness.

Vitamin ‘B’ is water-soluble. It is found in wheat, rice, yeast extract, liver and kidney. Lack of vitamin ‘B’ causes beri-beri.

Vitamin ‘C’ is water-soluble. It is found in citrus fruits, (orange, lemon, lime) and in many fresh vegetables. Lack of vitamin C causes scurvy.

Vitamin ‘D’ is fat soluble. It is found in fish oil, eggs, milk and milk products. Its deficiency causes rickets.

Question 2.
What are the sources and importance of the following minerals:
(a) Calcium, (b) Magnesium, (c) Potassium, (d) Zinc.
Answer:
(a) The main sources of calcium minerals are : Milk, cheese, eggs and green vegetables. It is also found in flour and breads. It helps in formation of bone, teeth and blood clotting. It also helps in muscles activity.

(b) Magnesium is found in cheese and green vegetables. It is found in whole meal bread, milk and fish. It helps in energy transfer and muscles activity. Magnesium is also helpful in bone and teeth formation. It works with calcium and vitamin C.

(c) Potassium is found in meats, fruits and vegetables. It is also found in milk, eggs, cheese, beef and potatoes. Its main function is to maintain balance in blood and tissues fluid. It also helps in nerve impulse conduction.

(d) Zinc is mainly found in onions, liver and green vegetables. Its importance in our diet is that it is an important part of hormone insulin.

Components of Food Class 6 HBSE Notes

1. We get energy from the food we eat. It gives us energy to work and play. It helps us to grow.

2. Food helps us in repairing or replacing damaged cells and tissues. It also protects our body from diseases and infections.

3. Food is an absolute necessity for sustaining body functions.

4. Food has many components; such as carbohydrate, fats, proteins, minerals and vitamins. All these are called nutrients.

5. Water and roughage are also necessary for our diet. They play a vital role in our diet.

6. On the basis of functions, they perform, the components of food may be classified as:

• Energy-giving food: carbohydrates and fats.
• Body-building food : proteins.
• Protective food: vitamins and minerals.
• Roughage and water: roughage helps in digestive system and water’ is essential for the body.

7. Carbohydrate is the main source of energy in our body. Proteins help in repairing of tissues, body building and many other functions.

8. Minerals and vitamins are very essential for our body. They are required in minor quantities for proper growth and body functions.

9. Vitamins are protective foods which are necessary for the well being of the body. They are needed in small quantities for carrying out various biological functions.

10. We should take a balanced diet means which contains all nutrients, such as carbohydrate, fats, proteins, vitamins and minerals in proper proportion. No single food can provide all the nutrients.

11. Over eating is also not good for a person, as he becomes fat and obese. Obesity may cause many diseases.

12. Sources of carbohydrates in our diet are; cereals grains such as corn and sorgham, peas, beans, sugarcane, sugar beet and many fruits such as banana, mango, melons and vegetables.

13. Many processed foods are rich in carbohydrates including breads. Pizzas, burgers, jams and jelleys, dried fruits, sugar and jaggery are also carbohy-drates.

14. Fats are obtained either from animals or from plants. Butter and ghee are obtained from animals. Groundnut oil, soyabean oil and mustard oil are derived from plants. Fats give more energy than carbohydrates.

15. Protein is obtained from animals and from plants both. Milk, fish, meat, ghee and eggs are main sources of animal proteins. Pulses and beans are sources of plant proteins.

16. Children suffering from protein—deficiency have light brown hair, oldman like face, always hungry and have distended stomach.

17. Proper amount of vitamins helps our body to function normally. Lack of vitamin A causes deficiency disease such as night blindness. Deficiency of vitamin B causes beri-beri and deficiency of vitamin ‘C’ causes scurvy.

18. Fibres and roughage is mainly given by plant foods: grains flour, cereals, potatoes, fresh fruits and raw and cooked vegetables provide roughages in our food.

19. If a person does not get adequate food or his/ her diet does not contain all the nutrients, he becomes weak and said to be suffering from malnutrition. Enough food without enough protein causes rickets.

20. Food may be vegetarian/non-vegetarian, balanced or unbalanced, simple or spicy, nourishing or junk food. Deep-fried and roasted foods usually loose their nutritive value.