std 6 science chapter 1 natural resources q bank – answers

Chapter 1 Natural Resources

Natural Resources – Air, Water and Land

1. What are the five layers of the atmosphere?

The five layers of the atmosphere are troposphere, stratosphere, mesosphere, ionosphere and exosphere.

2. What would have happened if there were no air on the earth?

The living world on the earth is sustained due to the balance between various gases and other constituents of air. Moreover, the atmosphere is a very important filter. It allows the light and heat of the sun to reach the earth, which is necessary for life. But it prevents the harmful elements from reaching the earth. If there is no air on the earth then all living organisms will not survive and there will be vast s=destruction on the earth.

3. In what ways is the water in seas and oceans useful even though it is salty?

Seawater is salty, so it is not potable, yet it is very useful as it helps in the process of water cycle. The sea water evaporates and turns into water vapour, which rises up and forms clouds. The water vapour in the clouds then condenses and comes down in the form of rain.

4. Do other living things use water like we do?

No, though all living things require water, they do not use water like we do.

5. What is land made of?

Land is made up of stones, soil and big rocks.

6. Is land flat everywhere?

Land is not flat everywhere. It is hilly in some places and flat in others.

7. What do you see on land?

We see the biotic and abiotic things on land.

8. Does man produce soil/land?

No man does not produce soil or land, it is a natural resource.

9. What has man created on land?

Man has constructed houses and roads on land. Man has also used land for farming.

10. If a deep pit is dug in the ground, what do you find there?

If a deep pit is dug in the ground we see the different layers of soil.

11. What are the constituents of soil? Classify them as biotic and abiotic constituents.

The biotic and abiotic components are the constituents of soil.

Biotic components include all the microorganisms and

Abiotic components include clay, sand, rocks, minerals, remains of dead plants and animals

Exercise

1. Fill in the blanks.

(a) The layer of ozone gas absorbs ultra violet rays that come from the sun to the earth.

(b) Of the total water available on the earth, fresh water forms 0.3 percent.

(c) Both biotic and aboitic constituents are present in the soil.for a complete worksheet click on the link below

for a complete worksheet click on the link below

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