NCERT Class 9 Science Natural Resources Questions

NATURAL RESOURCES

1. The atmosphere of the earth is heated by radiations which are mainly

(a) radiated by the sun

(b) re-radiated by land

(c) re-radiated by water

(d) re-radiated by land and water

2. If there were no atmosphere around the earth, the temperature of the earth will

(a) increase

(b) go on decreasing

(c) increase during day and decrease during night

(d) be unaffected

3. What would happen, if all the oxygen present in the environment is converted to ozone?

(a) We will be protected more

(b) It will become poisonous and kill living forms

(c) Ozone is not stable, hence it will be toxic

(d) It will help harmful sun radiations to reach earth and damage many life forms.

4. One of the following factors does not lead to soil formation in nature

(a) the sun

(b) water

(c) wind

(d) polythene bags

5. The two forms of oxygen found in the atmosphere are

(a) water and ozone

(b) water and oxygen

(c) ozone and oxygen

(d) water and carbon-dioxide

6. Rivers from land, add minerals to sea water. Discuss how?

7. How can we prevent the loss of top soil?

8. How is the life of organisms living in water affected when water gets polluted?

9. During summer, if you go near the lake, you feel relief from the heat, why?

10. In coastal area, wind current moves from the sea towards the land during day; but during night it moves from land to the sea. Discuss the reason.

11. Following are a few organisms

(a) lichen    (b) mosses    (c) mango tree    (d) cactus

Which among the above can grow on stones; and also help in formation of soil? Write the mode of their action for making soil.

12. Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

13. All the living organisms are basically made up of C, N, S, P, H and O. How do they enter the living forms? Discuss.

14. Why does the percentage of gases like oxygen, nitrogen and carbon dioxide remain almost the same in the atmosphere?

15. Why does moon have very cold and very hot temperature variations eg, from -190°C to 110°C even though it is at the same distance from the sun as the earth is?

Please refer to attached file for NCERT Class 9 Science Natural Resources Questions