CBSE Class 6

On this page, you will find Food Where Does it Come From Class 6 Notes Science Chapter 1 Pdf free download. CBSE NCERT Class 6 Science Notes Chapter 1 Food Where Does it Come From will seemingly help them to revise the important concepts in less time.

CBSE Class 6 Science Chapter 1 Notes Food Where Does it Come From

Food Where Does it Come From Class 6 Notes Understanding the Lesson

1. Anything which we eat to live is called food.

2. Food is a substance that we eat to grow, to get energy to work and to re-0main healthy.

3. Living things cannot survive without food.

4. Food provides materials for repair of damaged cells and to replace dead cells in the body.

5. Food enables us to fight against infections.

6. Different people eat different types of food according to their habits, lifestyle, taste and the availability of food items.

7. The food habits of different states are different.

8. The materials or substances which are used to make that particular dish are called ingredients.

9. No matter which state one belongs to, we will find that the ingredients used are more or less the same.

10. Various food items which we eat daily are usually made up of more than one ingredients.

11. The main sources of our food are: Plants and Animals.

12. Plants are the source of food materials like cereals, pulses, vegetables, fruits, sugar, oils, spices, tea, coffee, etc.

13. Animals provide us food items like milk, egg, chicken, meat, honey, fish, etc.

14. The various parts of plants which are used as food materials are roots, stems, leaves, flowers, fruits, seeds, etc.

15. Carrot, sweet potato, beetroot, radish, turnip, etc., are the roots of their respective plants.

16. Garlic, turmeric, onion, potato, ginger, etc., are the stems of their respective plants.

17. Some flowers which are eaten as food are sunflower, broccoli, cauliflower, dandelion, etc.

18. Apple, pumpkin, brinjal, lady’s finger are fruits of their respective plants.

19. Foodgrains such as wheat, rice, maize, barley, millet, gram, peas and pulses are all seeds of their respective plants.

20. Animal products such as meat, egg, fish, milk, cheese, butter, curd, honey, etc., are eaten as food. These foods are rich in proteins.

21. Animals eat only a few types of food.

22. Some animals eat only plants and are known as herbivores, some eat flesh of other animals and are known as carnivores whereas some eat both plants as well as animals and are known as omnivores.

23. There are many people in our country who do not get sufficient food to eat.

24. Food is very precious, We should not waste food in any form.

Class 6 Science Chapter 1 Notes Important Terms

Food: Any substance that can be metabolized by living things to give energy, to build tissue and which provides mental stimulus for thinking is called food.

Ingredients: The materials or components which are used to prepare food are called ingredients.

Edible: Those parts of a plant which are suitable for consumption and harmless to humans are called edible.

Sprouts: Any new growth of a plant or a seed such as a white coloured tiny roots, a new branch or a bud is called sprouts.

Nectar: A sweet liquid secretion found in flowers that is attractive to pollinators is called nectar.

Herbivorous: Animals that feed chiefly on plant and plant products are called herbivorous.

Carnivorous: Animals which eat only the flesh of other animals as their food are called carnivorous.

Omnivorous: Animals which eat both plants, as well as animals, are called omnivorous.

In this page, we are providing Garbage In Garbage Out Class 6 Extra Questions and Answers Science Chapter 16 pdf download. NCERT Extra Questions for Class 6 Science Chapter 16 Garbage In Garbage Out with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 16 Extra Questions and Answers Garbage in Garbage Out

Extra Questions for Class 6 Science Chapter 16 Garbage in Garbage Out with Answers Solutions

Garbage in Garbage Out Class 6 Extra Questions Very Short Answer Type

Question 1.
What is garbage?
Answer:
Waste materials or rubbish, specially used household wastes are called garbage.

Question 2.
Name the manure made from kitchen wastes.
Answer:
Compost

Question 3.
What are the sources of waste?
Answer:
Sources of waste are domestic, agricultural and industrial.

Question 4.
Name some materials that can be reused.
Answer:
Plastic, metal and glass.

Question 5.
What type of garbage is collected in green bins?
Answer:
Biodegradable garbage like kitchen, plant and animal wastes.

Question 6.
What is composting?
Answer:
Rotting and conversion of biodegradable materials into manure is called composting.

Question 7.
What is waste?
Answer:
Unwanted or unusable remains or by-products of materials or food is known as waste.

Question 8.
Name some materials that cannot be disposed of easily.
Answer:
Plastic products, polythene, glass, etc.

Question 9.
What is a dustbin?
Answer:
The container in which the waste materials are collected is called a dustbin.

Question 10.
What type of waste is collected in blue bin?
Answer:
Non-biodegradable materials bke plastics, metals and glass are collected in a blue bin.

Question 11.
What is vermicomposting?
Answer:
The process of making compost with the help of redworms is called vermicomposting.

Question 12.
What is recycling?
Answer:
The process of recovery and reprocessing of some materials to get new products is called recycling.

Question 13.
How waste are classified on the basis of degradability?
Answer:
Biodegradable and non-biodegradable.

Question 14.
What type of waste is generated from agricultural activities?
Answer:
Husk, bags, fertilizers, rotted plant products, livestock waste, etc.

Garbage in Garbage Out Class 6 Extra Questions Short Answer Type

Question 1.
What are the two main types of wastes based on their degradability?
Answer:
There are mainly two types of wastes:

• Biodegradable wastes, such as kitchen and other plant and animal wastes, which can be degraded by the action of organisms.
• Non-biodegradable wastes, like plastics, metals and glass, which cannot be degraded by the organisms.

Question 2.
How many types of bins are provided by the government for collecting garbage?
Answer:
The government provides two types of bins for collecting garbage. They are:

• Blue bins: It is to collect non-biodegradable wastes like plastic, metal and glass wastes.
• Green bins: It is to collect biodegradable wastes like vegetable and fruit peels, tea leaves, etc.

Question 3.
What is vermicomposting? How is vermicompost useful as compared to chemical fertilizer?
Answer:
The process of making compost with the help of redworms is called vermicomposting. Vermicompost is less expensive, high yielding crops and beneficial for soil health as compared to chemical fertilizers.

Question 4.
Why should we not use wastes that may contain salt, pickles, oil, vinegar and milk preparations as food for redworms in vermicomposting pit?
Answer:
We should not use wastes that may contain salt, pickles, oil, vinegar and milk products as food for redworms because these substances attract disease-causing small organisms in pit which may harm redworms ultimately hindering the preparation of vermicompost.

Question 5.
We should not burn or heat plastics, why?
Answer:
All kind of plastics give out harmful gases, upon heating and burning. These gases cause many health problems, including cancer, asthma, etc., which sometimes may cause death.

Question 6.
What can we do to minimise overuse of plastics?
Answer:
We should take following steps to minimise overuse of plastics:

1. We should avoid using plastic bags to store eatables.
2. We should not throw plastic bags here and there, after use.
3. We should never burn plastic bags and other plastic items.
4. We should not put garbage in plastic bags and throw it away.

Question 7.
Why should we not throw garbage in plastic bags?
Answer:
We should not throw garbage in plastic bags because when stray animals looking for food in these bags, usually knotted, are unable to reach the food and they end up eating the whole plastic bag. Sometimes, they die due to this. The plastic bags thrown carelessly on roads and other places get into drains and the sewer system. As a result, drains get choked and water spills on the roads which might even create a flood like situation during heavy rain.

Question 8.
How is compost prepared from kitchen wastes?
Answer:
The kitchen wastes generally include vegetable and fruit peels, egg shells, waste food etc., which are completely biodegradable. We put these waste into a pit and cover them with soil. After some days, we observe that they are completely degraded. Take them out of the pit and mix it in the soil where you grow your favourite plants. The final form of the wastes mixed with soil is called compost.

Garbage in Garbage Out Class 6 Extra Questions Long Answer Type

Question 1.
What is a garbage? Explain with examples. What will happen if garbage is not removed from our homes and surroundings regularly?
Answer:
Waste materials or rubbish that include refuse, domestic wastes, used plastic items and wrapping materials are called garbage. Every house produces a lot of garbage daily. Garbage is produced also by offices, shops, schools, etc., every day. Kitchen wastes include vegetables and fruit peels, egg shells, waste food or left over food, tea leaves, plastic and polythene bags or tins, waste paper, etc.

If these garbages are not removed, our homes and surroundings will become dirty. Some of the garbage give out a foul smell after rotting. The rotting garbage becomes a breeding place for cockroaches, flies and mosquitoes which spread many fatal diseases.

Question 2.
What are the various methods of garbage disposal? Describe the landfill method.
Answer:
There are different methods of disposal of garbage depending on the nature of garbage. Some of the effective measures are:

1. Composting
2. Vermicomposting
3. Recycling
4. Reuse
5. Landfill

Landfill is one of the important and effective measures of garbage disposal. The method is generally adopted in cities/town. Landfill is a low-lying area where the garbage from the cities or towns are collected. It generally outside the city. The non-useful part of garbage which cannot be turned into compost or cannot be recycled or reused is disposed off in a landfill. People throw garbage in the dustbins or at a place meant for this. These garbage is collected by trucks or tractors of the municipal corporation and take it to the landfill areas.

Wastes dumped in landfill is compacted everyday with the bulldozers and then filled with a layer of soil prior to waste placement of next day. This way when the landfill is completely filled, it is turned into a park or a playground.

Question 3.
What are the uses and harms of plastic?
Answer:
Plastics are both useful and harmful.
Its uses are as follows:

1. It is used as container to store edible foods.
2. Goods packed in plastic packs are easily portable, i.e., can be carried anywhere easily.
3. Plastic can be recycled.
4. Plastics are unreactive. So, plastic bottles are used to pack chemicals.
5. Plastic packs or containers are cheap, light weighted and durable.

Its demerits or harm are as follows:

1. On heating or burning, plastic emit harmful gases which cause many diseases including cancer.
2. The plastic bags thrown here and there are swallowed by animals searching for food inside them, which sometimes causes their death.
3. Plastic bags and polythene thrown on roads get into the drains and block the sewer system. Sometimes making the drain choked. During heavy rain, it creates flood-like situation.

Question 4.
What is vermicomposting? Mention the steps for preparing vermicompost.
Answer:
Process of conversion of kitchen wastes and agricultural wastes or biodegradable wastes using redworms is known as vermicomposting. The product so obtained by vermicomposting is known as vermicompost. Vermicompost is an excellent, nutrient-rich organic fertiliser.

For preparing vermicompost, spread a net at the bottom of pit or a box. Add 1-2 cm thick layer of sand and then spread biodegradable wastes like vegetable and fruit peels, green leaves, husk, etc., and sprinkle some water to make the layer wet.

Now buy some redworms and put them into the pit and cover them with gunny bags. Observe the content after 3-4 weeks. If it doesn’t smell bad and there is a loose soil-like material then the process of vermicomposting is complete. Sieve this content and sun dry it.

Question 5.
Excessive use of plastics are harmful. What measure can be adopted to reduce excessive use of plastics?
Answer:
The measures we can adopt to minimise overuse of plastics are:

1. We should try to make minimum use of plastic bags. We must reuse the bags whenever, it is possible to do so.
2. We should not use plastic bags to store eatables.
3. We can insist shopkeepers to use paper bags. We should carry cloth or jute bags while going to market for shopping.
4. We should never throw plastic bags here and there or on roads after use.
5. We should never bum plastics.
6. We should not put garbage in plastic bags and throw it away.
7. We should aware people of using proper practices for disposing plastic bags.

Question 6.
What can we do to minimise garbage generation? ‘
Answer:
We can take following steps to reduce garbage generation.

1. We can adopt the method of vermicomposting at home and deal with our kitchen waste carefully.
2. We should recycle paper, old books, metal cans, glass bottles, etc., by selling these items to kawadiwalas.
3. We should use both sides of paper to write. We should use a slate for rough work.
4. As far as possible, we should make our family, friends and others aware of the garbage hazards and to follow proper practices for disposing different kinds of wastes.
5. In a nutshell, we must bear in our mind and think about that-more garbage we generate, more difficult it will be to get over this menace.

Garbage in Garbage Out Class 6 Extra Questions HOTS

Question 1.
Write one word for the following statements:
(a) Contents of the waste bins
(b) Greeting cards made of waste paper
(c) Redworms converting certain waste into manures
Answer:
(a) Garbage
(b) Paper mache
(c) Vermicomposting

Question 2.
To what use will you put these garbage and how?
(a) Piles of straw after harvesting
(b) Rotting smelly garbage
(c) Metal cans
(d) Non-recyclable nappies, pickles, etc.
Answer:
(a) Convert into compost and use as manure.
(b) Convert into compost and use as manure.
(c) Give for recycling or reuse it.
(d) Throw in landfill as they can’t be either use for composting or recycling.

Question 3.
Why do earthworms are called farmer’s Mend?
Answer:
Earthworms are called farmer’s Mend because of the services provide by them in increasing and improving soil fertility, texture and moisture holding capacity which consequently benefits the plant. They decompose the organic matter into manure and improve the aeration of soil as they dwell in.

Question 4.
Most of the time we observe that rag pickers suffer from diseases. Why?
Answer:
Rag pickers work barefoot and without gloves in an unhygienic environment full of contaminated materials. Their entire workplace is actually a breeding ground of mosquitoes which carry various infectious diseases with them. So they often suffer from diseases.

Question 5.
Write merits and demerits of landfill.
Answer:
The merits of landfills include low operating costs and the ability to dispose of large amount of wastes. Demerits include possible water contamination and emission of greenhouse gases.

Garbage in Garbage Out Class 6 Extra Questions Value Based (VBQs)

Question 1.
Anandi thought of cleaning her room. While cleaning she found many of her old things and toys in good condition. She got an idea that beside throwing these things she can give these to an orphanage where children of her age can use these.
(a) What is waste?
(b) Which is better-reuse or recycle? Why?
(c) Which of the method of 3R’s is been used by Anandi here?
(d) What values of Anandi is shown here?
Answer:
(a) Things that are no longer useful or wanted and discarded are known as waste.
(b) Reuse is the better method of waste management than recycle, because reuse needs negligible energy as compared to recycle.
(c) Anandi by giving her belongings to orphanage is using the method of reuse amongst the 3R’s.
(d) Anandi is environment concern, sensible, responsible and intelligent girl.

Question 2.
Rishabh and Rishikesh both are best friends. Rishabh is very particular in segregating the waste generated in his house. He makes compost out of his kitchen waste and use this compost in manuring his potted plants. Rishikesh do not bother of segregating his household waste and even throws wrappers and plastics in the roads.
(a) Out of the 3R’s which one is suitable for plastics?
(b) What are the effects of plastic on the environment?
(c) Compare Rishabh’s and Rishikesh’s attitude towards environment.
(d) What value of Rishabh is shown here?
Answer:
(a) We must minimise the use of plastics so ‘reduce’ is the best way for checking waste generation.
(b) Plastics are non-biodegradable waste. Excessive use of plastics and their improper disposal is causing environmental degradation. Plastics even can’t be burnt because of the toxic gases released by them. Most of the plastics are non-recyclable also.
(c) Rishabh is eco-friendly but Rishikesh is not eco-friendly.
(d) Rishabh is intelligent, hardworking, sensible to environmental degradation and eco-friendly.

In this page, we are providing Air Around Us Class 6 Extra Questions and Answers Science Chapter 15 pdf download. NCERT Extra Questions for Class 6 Science Chapter 15 Air Around Us with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 15 Extra Questions and Answers Air Around Us

Extra Questions for Class 6 Science Chapter 15 Air Around Us with Answers Solutions

Air Around Us Class 6 Extra Questions Very Short Answer Type

Question 1.
Name some musical instruments in which air plays an important role.
Answer:
Flute, saxophone, trumpet, horn, etc.

Question 2.
What do human beings release during respiration?
Answer:
Co2

Question 3.
What is the layer of air that surrounds the earth is called?
Answer:
Atmosphere

Question 4.
What is the necessary condition for the combustion to take place?
Answer:
Presence of air

Question 5.
Which gas is present in the atmosphere which is essential for breathing?
Answer:
Oxygen

Question 6.
Which component of air acts as a supporter of combustion?
Answer:
Oxygen

Question 7.
Which component of air acts as a non-supporter of burning?
Answer:
Nitrogen and carbon dioxide.

Question 8.
Why transparent glass window becomes hazy, if not wiped off regularly?
Answer:
Because dust particles settle on it.

Question 9.
Name one insect which lives deep under the soil.
Answer:
Earthworm

Question 10.
What is moving air called?
Answer:
Moving air is called wind.

Question 11.
Which gas is the major component of air? State its composition.
Answer:
Nitrogen gas (78%)

Question 12.
What is the relative proportions of nitrogen and oxygen in the air?
Answer:
4:1

Question 13.
Name a device which uses wind energy to generate electricity.
Answer:
Windmill

Question 14.
Name the device which shows the direction of wind.
Answer:
Weather cock

Question 15.
Why do earthworms come out of the soil during heavy rains?
Answer:
During heavy rain, water fills up the spaces occupied by air. So earthworms have to come out to breathe air.

Air Around Us Class 6 Extra Questions Short Answer Type

Question 1.
Why air is considered as mixture?
Answer:
Air contains oxygen and nitrogen as its major constituents along with carbon dioxide, and other gases. These gases retain their properties in air. So, the air is called a mixture.

Question 2.
Name the major constituents of air. Also give their volume proportions in air.
Answer:

Question 3.
What is atmosphere?
Answer:
The thin layer of air that surrounds the earth as an envelope is called atmosphere.

Question 4.
What is smoke?
Answer:
The dark-coloured gases caused by burning of anything is called smoke.

Question 5.
State the properties of air.
Answer:
Properties of air are as follows:

1. It is colourless
2. It is transparent
3. It is compressible
4. It occupies space
5. It is soluble in water
6. It has mass

Question 6.
What will happen if the amount of oxygen is increased in the air?
Answer:
Air will become more combustible and many substances may undergo fast oxidation.

Question 7.
State the properties of oxygen gas.
Answer:
Oxygen is a colourless, tasteless and odourless gas. It is soluble in water. Oxygen gas is essential for breathing (or respiration).

Question 8.
Why do you think, policemen wear masks?
Answer:
Policemen wear masks to prevent dust particles from getting into their respiratory system.

Question 9.
What do you mean by relative humidity?
Answer:
The content of water vapour in the air is expressed in the terms of humidity or relative humidity.

Question 10.
Why during an incident of fire, one is advised to wrap a woollen blanket over a burning object.
Answer:
Air is supporter of combustion. To cut-off the supply of air from the burning object it is advised to wrap a woollen blanket around it.

Air Around Us Class 6 Extra Questions Long Answer Type

Question 1.
What is the importance of water vapour in air?
Answer:
When air comes in contact with a cool surface, it condenses and forms tiny drops of water on the cooled surfaces. The presence of water vapour in the air is important for maintaining the water cycle in nature.

This is because it is water vapour present in the air which rises high in the sky along with hot air, get cooled, condenses to form clouds and then brings rain on the earth.

Question 2.
Explain briefly carbon dioxide gas and its properties.
Answer:
Carbon dioxide is a colourless and odourless gas. It is soluble in water. It neither burns nor supports burning. Co2 extinguishes a burning fire. Plants and animals consume oxygen for respiration and produce Co2 which is necessary for photosynthesis. It is an important greenhouse gas.

Question 3.
What are the uses of air?
Answer:
Air is useful to human beings in many ways. Some of the important uses of air are as follows:

1. It is used for breathing purpose.
2. It is used for burning fuels to make fire.
3. It helps the birds, bats and insects in flying.
4. It plays an important role in the water cycle in nature.
5. Compressed air is used in tyres of various kinds of vehicles.
6. It also helps in the dispersal of seeds and pollens of flowers of several plants.

Question 4.
Why the animals living deep inside the soil come out during heavy rains?
Answer:
The air is present in spaces between particles of soil. Animal living inside the soil get oxygen for breathing (or respiration) from the air present between the soil particles. However, when it rains heavily water fills up the spaces occupied by the air in the soil.

In this situation, the animals living inside the soil have to come out of the soil to obtain air for breathing. For example, the earthworms come out of the soil only during heavy rains.

Question 5.
Why we must always breathe in through our nose and not by our mouth?
Answer:
We inhale air when we breathe through our nostrils. We also know that air contains dust particles. To prevent dust particles from getting into the respiratory system, fine hair and mucus are present inside the nose.

Since our mouth does not contain the above-discussed barriers of dust, so if we breathe through it, dust particles may enter in our respiratory tract. This is why breathing through mouth is not suggested.

Air Around Us Class 6 Extra Questions HOTS

Question 1.
How will you prove that air is a mixture of several gases and not a compound?
Answer:

• The component of air varies from place to place.
• Components of air can be separated out.
• Different components of air retain their properties.

Question 2.
Why long chimneys are present in factories?
Answer:
Most of the factories produces harmful smoke and gases. So factories have long chimneys to carry these harmful gases away from our noses.

Question 3.
How nature maintains a balance of Co2 and o2 in atmosphere?
Answer:
Plant releases oxygen which is consumed by animals in the process of respiration. Animals release carbon dioxide which is consumed by the plants for the process of photosynthesis.

Question 4.
There are two colourless and odourless gases in jars A and B. One is oxygen and other is carbon dioxide. How will you detect which jar contain oxygen and which contain carbon dioxide gas?
Answer:
We can detect the gas as oxygen or carbon dioxide by bringing a burning splinter near the mouth of the jars. The gas which will support burning is oxygen gas and which will not support burning, i.e., extinguishes a burning splinter, is carbon dioxide gas.

Question 5.
Why is atmosphere important for sustenance of life on the earth?
Answer:
Atmosphere is important for the following reasons:

1. It keeps the temperature of earth fairly constant.
2. It contains all the gases essential for sustaining life.
3. It protects us from harmful UV radiations.
4. It maintains water cycle.

Air Around Us Class 6 Extra Questions Value Based (VBQs)

Question 1.
Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. She was amazed and asked about this phenomenon to her science teacher.
(a) Why Garima observed tiny bubbles inside the bottle?
(b) What will happen to the bubbles if we bring it back to normal room temperature?
(c) When do we see the above phenomenon in nature and what is its significance?
(d) What values of Garima is shown here?

Answer:
(a) As the water in the bottle get warm due to the heat of sunlight air dissolved in it escaped and appeared as tiny bubbles.
(b) Tiny bubbles will again disappear in the water.
(c) We see the above phenomenon in summer season when oxygen dissolved in water reduces due to hot temperature and because of this aquatic life suffers.
(d) Garima is observable, intelligent, curious girl with scientific temperament.

Question 2.
While going for a local excursion to a deserted area, Vikas wore a mask. When boarding the school bus his friends made fun of him that he was looking odd and beside enjoying he is taking extra precautions. But when going through the dry roads all of his friends felt the need of the mask. He suggested everyone to tie handkerchief on their nose. It helped them a lot.
(a) What is dust?
(b) What are the health issues related with dust?
(c) How does a mask help?
(d) What values of Vikas is shown here?

Answer:
(a) Dust is tiny particles of earth or waste lying on ground or carried by the air.
(b) Dust particles badly effects our respiratory system. It may cause asthma, allergy, respiratory problems, etc.
(c) Mask acts as a barrier for the entry of dust particles directly into our nose. It filters the air.
(d) Vikas is intelligent, helpful and have future vision.

In this page, we are providing Water Class 6 Extra Questions and Answers Science Chapter 14 pdf download. NCERT Extra Questions for Class 6 Science Chapter 14 Water with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 14 Extra Questions and Answers Water

Extra Questions for Class 6 Science Chapter 14 Water with Answers Solutions 

Water Class 6 Extra Questions Very Short Answer Type

Question 1.
Can you name some activities where water is used for recreation?
Answer:
River rafting, swimming, water games, water park, etc.

Question 2.
Name some sources of water.
Answer:
Hand pump, tube well, river, pond, lake, ocean, etc.

Question 3.
From where do lakes and ponds get their water?
Answer:
Rains

Question 4.
Name two main processes which transfer water present on the earth into water vapour continuously.
Answer:
Evaporation and transpiration.

Question 5.
What name is given to the process in which rainwater is made to percolate into the ground efficiently?
Answer:
Rainwater harvesting

Question 6.
What is the ultimate source of water?
Answer:
Rain

Question 7.
What are the different forms of precipitation?
Answer:
Rain, snow and dew.

Question 8.
What will happen if there is a continuous rain?
Answer:
This results into floods.

Question 9.
Name the process which is involved in the formation of dew?
Answer:
Condensation

Question 10.
Name the condition given to the extreme dryness in an area due to lack of rains for a long period.
Answer:
Drought

Question 11.
What is the main source of groundwater?
Answer:
Rainwater

Question 12.
List one use of water.
Answer:
Water is essential for the germination of seeds.

Question 13.
Name the term used for falling of water drops from sky.
Answer:
Precipitation

Question 14.
Name the states where roof top water harvesting is used to collect water.
Answer:
Tamil Nadu and Rajasthan.

Question 15.
What is the process of changing water into vapour called?
Answer:
Vapourization

Water Class 6 Extra Questions Short Answer Type

Question 1.
What is glacier?
Answer:
A glacier is a persistent body of dense ice that is constantly moving under its own weight. The rivers get their water from the melting of these glaciers.

Question 2.
Why is water important for us?
Answer:

1. Water regulates body temperature by the process of respiration and evaporation.
2. All metabolic reactions in the body take place in aqueous medium.
3. It transports minerals and food materials in plant’s and animal’s body.

Question 3.
What is water cycle?
Answer:
Water constantly moves from the earth to the air and back again. The constant circulation of water is known as the water cycle.

Question 4.
What are the different ways by which water vapour is put into the atmosphere?
Answer:
Water in oceans, lakes and ponds get evaporated due to atmospheric heat. Factories and thermal power stations produce a lot of steam and put it into the atmosphere. Plants lose water through transpiration. Animals lose water through respiration, sweating and excretion. All this vapour accumulates in the atmosphere.

Question 5.
What is precipitation?
Answer:
When water drops come together in the air, it becomes heavy and begin to fall. Falling of water drops is called precipitation.

Question 6.
What are the two main techniques of rainwater harvesting?
Answer:
The two main techniques of rainwater harvesting are:

• Roof-top rainwater harvesting
• Rainwater harvesting from open spaces around buildings.

Question 7.
How does rainwater become saline?
Answer:
Water is a universal solvent because it dissolves a large number of substances. When rain falls, it dissolves common salts and many other substances and minerals present on the earth. The rainwater passes through different layers of earth, rocks, dissolves large amount of salt and other minerals. Thus it becomes salty.

Question 8.
Explain the roof-top rainwater harvesting.
Answer:
In this technique, the rainwater from the roof-top is collected in a storage tank with the help of pipes. Here it is filtered and then sent into a pit. The water in the pit seeps or percolates slowly into the ground to recharge the groundwater.

Question 9.
How does water cycle help in maintaining global climate?
Answer:
Water cycle plays an important role in the world climate. Ocean absorb vast quantities of heat and help in global warming. By absorbing heat, water evaporates and on condensation releases heat. This absorption and releasing of heat in the form of energy drives weather pattern in the short-term and regulate the climate for long time.

Water Class 6 Extra Questions Long Answer Type

Question 1.
Explain the process of water cycle in nature with the help of suitable diagram.
Answer:
Water constantly moves from the earth to the air and back again. The constant circulation of water is known as the water cycle. The water in seas, rivers, lakes, ponds or streams evaporates because of the heat of the sun. Plants also give out large amounts of water from their leaves. The water vapour rises up. The air higher up in the atmosphere is cooler.

This cools the water vapour and its condenses to form tiny drop of water. These drops of water together form clouds. As the clouds get cooled further, the water drops become bigger and heavier. When they become too heavy, they fall on the earth as rain and fill the sources of water like river, ponds, streams, etc.

Question 2.
List the uses of water.
Answer:
Uses of water are:

1. It is needed for drinking, bathing, washing, cleaning of vessels, toilets, flushing, etc.
2. Our body contains about 70% of water. Hence, water is essential for our life.
3. Water helps animals and plants to keep themselves cool.
4. Water is required for irrigation.
5. Water is used to generate electricity.
6. Water is used for recreational activity.
7. Water is habitat of many aquatic plants and animals.

Question 3.
Explain about the sources of water.
Answer:
Sources of water can be classified as:

• Surface-water: Rivers, lakes, ponds, streams, oceans, etc., are surface water which is continually replenished by rainwater runoff and melting of glaciers. Most of the human activities, like drinking, washing, farming, etc., rely on freshwater supply. Two-third of Earth’s surface is covered with oceans and seas. Water from these sources are not fit for drinking or any other human activities. Surface water act as natural habitat for many plants and animals.

• Groundwater: Water present beneath Earth’s surface in soil pore spaces and in fractures of rock formations. It is stored there and moves slowly through geologic formation of soil, sand and rocks called aquifers. Groundwater is mainly replenished through seepage of rainwater and surface water.

• Rain: Rain is liquid water in form of droplets that have condensed from the atmospheric water vapour and then precipitated, i.e., become heavy enough to fall under gravity.

• Glaciers and snow: Glacier is a persistent body of dense ice that is constantly moving under its own weight. It forms where the accumulation of snow exceeds its melting. Glacial ice is the largest reservoir of freshwater on Earth.

Question 4.
What is drought? When does drought occur?
Answer:
Drought is a long period without rains leading to severe shortage of water in the region.
The soil continues to lose water by evaporation and transpiration. The water lost by soil is usually made up by rains. If, however, it does rain at all or the rainfall is very low for a long period, the loss of water from the soil is not made up and hence the soil becomes dry.

Due to lack of rains, the water level in the lakes and ponds also goes down and some of them may even dry up completely. In the absence of rains, no water seeps into the ground and hence the level of groundwater in wells, etc., falls drastically. Due to this groundwater also becomes scarce. In this way, a prolonged period of no rains or very low rains causes all around shortage of water leading to drought.

Question 5.
How is rain useful to us?
Answer:
Rainwater is useful to us in the following ways: ,

1. Rains bring relief by cooling the environment after hot summer days.
2. The sowing of many crops depends on the arrival of rains during monsoon.
3. Rains provide water in the rivers and dams of hydroelectric power plants.
4. Rains fill the lakes and ponds which acts as source of water.
5. Rains are also responsible for recharging the groundwater and thus maintaining water table.

Water Class 6 Extra Questions HOTS

Question 1.
What are the factors affecting rate of evaporation?
Answer:
(a) Temperature: Higher is the temperature higher will be the rate of evaporation.
(b) Wind velocity: Higher is the wind velocity higher will be the rate of evaporation.
(c) Surface area: Larger is the surface area, i.e., exposed area, larger will be the rate of evaporation.
(d) Humidity: Humidity is the presence of moisture in air. Higher is the humidity, less will be the the rate of evaporation.

Question 2.
How does water kept under the shade of a tree also gets evaporated?
Answer:
Air around us gets heated from sunlight. This warm air provides heat for evaporation of water kept in
the shade.

Question 3.
What will happen if we are lost in a sea and drink lot of sea water to quench our thirst?
Answer:
The sea water is highly saline. Drinking this water will cause diarrhoea and loss of too much water from our body through frequent urination. Thus, will cause dehydration and ultimately death.

Question 4.
In what ways does water serves to sustain life?
Answer:
Water controls various biological processes like, transpiration, ingestion, excretion, digestion, etc. Moreover 70% of our body weight comprises of water.

Question 5.
Dissolve two spoons of common salt in half a cup of water. Now, if you want to get the salt back, what will you do?
Answer:
To get the salt back from its solution, the solution is heated in a container till all the water gets evaporated. The white powdery substance that is retained back is the salt

Water Class 6 Extra Questions Value Based (VBQs)

Question 1.
On a summer vacation, Ria went to her village to spent her holidays. After staying there for some days she realised the problem of shortage of water faced by the villagers. She along with her father went to the office of water supply department of her village and conveyed them the problem of water shortage.

The officer of water supply department assured Ria and her father that they will do something to overcome this shortage but the villagers must also adopt water conservation practices to use water judiciously. Ria thought to make villagers aware of water conservation practices with some interesting play so that they could understand its importance.
(a) Where did Ria went in her summer vacation?
(b) What did she observed there?
(c) What do mean by water conservation?
(d) What practices could help in conserving water?
(e) What values of Ria is shown here?

Answer:
(a) Ria went to her village in summer vacation.
(b) She observed water shortage there.
(c) Water conservation refers to strategies and activities made to manage fresh water as a sustainable resource to meet current and future human demand.
(d) (i) Use water judiciously.
(ii) Use water from washing machine, bathing and moping in watering plants or flushing toilets.
(iii) Check leaking pipes and get it’repaired.
(iv) Use high-efficiency toilets that use less water in a flush.
(v) Water the plants at night to reduce loss of water due to evaporation.
(e) Ria is an intelligent, responsible, understanding, sensible and innovative girl.

Question 2.
Whenever Sajia returns from school she empties her water bottle in the potted plant instead of throwing it in the sink. She always keep her eyes on her housemaid that the water after mopping the house must be used for watering the plants in the garden.
(a) Can you suggest any other use of the water left after mopping?
(b) What is the function of water in plants?
(c) What values of Sajia is shown here?
Answer:
(a) We can use the water after mopping in flushing the toilets.
(b) Water in plants help in transportation, maintaining turgidity, photosynthesis and cooling through transpiration.
(c) Sajia is eco-friendly, responsible and intelligent girl.

In this page, we are providing Fun with Magnets Class 6 Extra Questions and Answers Science Chapter 13 pdf download. NCERT Extra Questions for Class 6 Science Chapter 13 Fun with Magnets with Answers will help to score more marks in your CBSE Board Exams.

Class 6 Science Chapter 13 Extra Questions and Answers Fun with Magnets

Extra Questions for Class 6 Science Chapter 13 Fun with Magnets with Answers Solutions

Fun with Magnets Class 6 Extra Questions Very Short Answer Type

Question 1.
Name two magnetic materials
Answer:
Iron and cobalt

Question 2.
Name the first magnet.
Answer:
Lodestone

Question 3.
Name three non-magnetic materials.
Answer:
Paper, plastic and clay.

Question 4.
How many poles are there in a magnet?
Answer:
Two

Question 5.
Can we have an isolated north or south pole?
Answer:
No

Question 6.
Which is the north pole of a bar magnet?
Answer:
It is the tip of a bar magnet that points towards the north direction.

Question 7.
In which direction the pointed end of the needle of a compass always points?
Answer:
North

Question 8.
Where is the attraction maximum in the magnet?
Answer:
Attraction is maximum at the poles.

Question 9.
How can you separate a magnetic substance from a mixture?
Answer:
By using a bar magnet, the magnetic substance is separated from a mixture.

Question 10.
In which direction does a suspended magnet come to rest?
Answer:
North-south direction

Question 11.
To which part of the magnet do none or only a few iron filings stick?
Answer:
Minimum number of iron filings stick to the middle part of the magnet.

Question 12.
What happens when similar poles come close to each other?
Answer:
They repel each other

Question 13.
Which property of a magnet is used for the testing of permanent magnet?
Answer:
Repulsion property

Question 14.
Permanent magnets do not loose their magnetism even after a long period of time. Is it true or false?
Answer:
True

Question 15.
What should be kept in between the bar magnets while storing?
Answer:
A piece of wood.

Fun with Magnets Class 6 Extra Questions Short Answer Type

Question 1.
What is a magnet? Mention their classification.
Answer:
A magnet is a substance that has the property of attracting objects made of iron, cobalt and nickel. On the basis of their occurrence, the magnets can be classified as:
(a) Natural magnets
(b) Artificial magnets.

Question 2.
What are magnetic materials? Explain with examples.
Answer:
Magnetic materials are those materials which get attracted to magnets. For example, materials made of metals as iron, nickel, cobalt, etc.

Question 3.
What are non-magnetic materials? Explain with examples.
Answer:Non-magnetic materials are those materials that do not get attracted to magnets. For example, paper, wood, plastics, etc.

Question 4.
What are properties of magnets?
Answer:
The properties of magnets are:

1. It attracts iron pieces towards itself.
2. It always aligns itself in the same direction if allowed to rotate freely.
3. It is composed of oxides of iron (Fe304).

Question 5.
Categorise the given substances into two groups-magnetic and non-magnetic.

Answer:

Question 6.
Why does bar magnet always point in north-south direction?
Answer:
Bar magnet always points in north-south directions when left freely suspended because earth itself behaves likes a magnet and north pole of bar magnet is attracted towards south pole of earth’s magnet and vice-versa.

Question 7.
What are the poles of magnet?
Answer:
A magnet has two ends. They are called poles of magnet. One is north pole (N) and the other is the south pole (S).

Question 8.
What is magnetic field?
Answer:
The area around a magnet where its effect can be felt is known as magnetic field. It is more at the poles.

Question 9.
What are temporary magnets?
Answer:
There are some magnets that lose their property of magnetism after a short period of time. These are called as temporary magnets.

Question 10.
What are the ways by which a magnet can be demagnetized?
Answer:
Ways by which a magnet can be demagnetized are:

1. Throwing or dropping the magnet from a height.
2. Heating the magnet.
3. Hammering the magnet.
4. Improper storing

Question 11.
How should we store a magnet?
Answer:
A magnet also loses its magnetism if it is not stored properly. Bar magnets must always be stored in pairs with their opposite poles on the same side. A piece of wood is kept in between to separate them. In case of horse-shoe magnet, a single magnet keeper should be kept in such a way that it should touch both the poles of the magnet.

Question 12.
What are permanent magnets?
Answer:
The magnets that do not lose their property of magnetism even after a long period of time are called permanent magnets.

Question 13.
Can we isolate north pole or south pole of a magnet? Give reason.
Answer:
No, we cannot isolate north pole of a magnet from its south pole or vice-versa. If we break a bar magnet into two halves, we will not get a single north or south pole but two magnets each with its north and south poles.

Question 14.
Draw the diagram of
(a) Bar magnet
(b) Horse-shoe magnet.

Fun with Magnets Class 6 Extra Questions Long Answer Type

Question 1.
Differentiate between magnetic and non-magnetic materials.
Answer:

Question 2.
List the properties of poles of the magnet.
The poles of a magnet have some very important properties. They are:

1. A freely suspended magnet always comes to rest in the north-south direction.
2. Attraction is maximum at the poles of a magnet. It is because these points have maximum magnetic strength. On moving towards the centre, the magnetic power keeps on decreasing.
3. Both the poles of a magnet have approximately same capacity to attract.
4. Two poles of a magnet can never be separated. This means that the poles of a magnet always exist in pair in a piece of a magnet.
5. Similar poles repel each other while the dissimilar poles attract each other.

Question 3.
How was magnet discovered?
Answer:
Once upon a time in Greece, there lived a shepherd named Magnes. He used to take his herd of sheep and goats to the nearby mountains for grazing. He used to carry a stick with small piece of iron attached to it for controlling his herd. One day he was surprised to find that he had to pull hard to free his stick from a rock on the mountainside. The rock was a natural magnet that attracted the iron tip of the shepherd’s stick. This was how magnet was discovered. Such rocks were given the name magnetite, perhaps after the name of that shepherd.

Question 4.
How can we convert an iron strip into a temporary magnet?
Answer:

The procedures for converting an iron strip into a temporary magnet are:

1. Keep the iron strip on a solid surface.
2. Take the bar magnet and gently rub it along the length of the iron strip.
3. Repeat this activity for about 20 – 30 times.
4. In order to test whether the iron strip has become a magnet or not, bring some iron nails near it and observe.

In this way, an iron strip can be converted into a temporary magnet.

Question 5.
What are the uses of magnets?
Answer:
The uses of magnets are as follows:

1. ATM, credit and debit cards have a magnetic strip that stores information and enables transactions of money.
2. Magnetic recording devices such as VHS, audio cassettes, computers, floppy disks and hard disks have magnets for recording data.
3. Magnets are used in junk yards to separate iron objects other waste materials.
4. Magnetic compass is used to find directions. It has a small magnetic needle at its centre.
5. Maglev or Magnetic levitation trains have been developed in America. These trains are without wheels and move a little above the rails.
6. The trains are pulled by the magnetic force that acts on the rails.

Fun with Magnets Class 6 Extra Questions HOTS

Question 1.
How do the ragpickers collect iron object from roads and waste materials?
Answer:
Ragpickers carry a huge magnet with them suspended with a thread. Whenever they bring the magnet near the heap of wastes having iron pieces, they stick to the magnet.

Question 2.
Why is compass needle is kept in a glass casing?
Answer:
As compass needle is a small and thin magnetised needle, it can get affected by the air and dust setting on it. So to avoid any kind of hindrance by outer environment compass needle is kept in a glass casing.

Question 3.
You are given two rods. Out of these, one is an iron rod and the other one is magnet, how will you identify these rods?
Answer:
Take both the rods and suspend them separately. Bring one end of a bar magnet close to both the ends of the suspended rod. If it shows attraction at both the ends then it is an iron rod. If it shows attraction at one end and repulsion at the other end then it is a bar magnet.

Fun with Magnets Class 6 Extra Questions Value Based (VBQs)

Question 1.
Sarika went to a fair nearby her house. She saw a stall with lots of people gathering there playing some game. She also went there. The game was to put a small iron ball into a hole named as ‘prize’ and if somebody does so they will win a great prize for that. There were 3 more holes adjacent to the ‘prize’ hole which do not have any gift or prize. Nobody was able to put the ball into the prize hole. Sarika got the trick of the shopkeeper that he had put a magnet near the mouth of each hole except the ‘prize’ hole. She made all the people aware of the wicked trick made by the shopkeeper. All of them praised Sarika for her intelligence.
(a) What is a magnet?
(b) Name any three types of magnet.
(c) What values of Sarika is shown here?
Answer:
(a) Substance that has the property of attracting object made of iron, cobalt and nickel is magnet.
(b) Three types of magnet are bar magnet, U-shaped magnet and ring or disc-shaped magnet.
(c) Sarika is an intelligent, self-aware, helpful and knowledgeable girl.

Question 2.
Aslam with his mother went to the market to buy some fresh vegetables. Aslam’s mother asked the shopkeeper to give 1 kg tomatoes. While the shopkeeper was weighing tomatoes, Aslam observed something attached below one of the pan of the beam balance. He at once informed this to his mother. His mother scolded the shopkeeper for using unfair meAnswer:The shopkeeper felt sorry for this.
(a) What do you think was attached below the pan of a beam balance by the shopkeeper?
(b) What are the other uses of the thing you have mentioned above?
(c) What values of Aslam is shown here?
Answer:
(a) Magnet was attached to the pan of the beam balance.
(b) Magnets are used in refrigerator, tape recorder, CD, TV, etc.
(c) Aslam is alert, intelligent, aware and conscious boy.