Tuesday, 25 October 2016



                             CLASS - IX Science (Natural resources)
                                           WORKSHEET-1

 1. Water vapours changes into water droplets by:-
 (a) condensation (b) evaporation (c) sublimation (d) none [1]
 2. Which of the following is a green house gas?
 (a) CO2 (b) O2 (c) ozone gas (d) both (a) and (b) [1]
 3. Layer of earth where life is possible is called
 (a) biosphere (b) lithosphere (c) hydrosphere (d) none [1]
 4. Main constituent of atmosphere of mars is:- (a) O2 (b) CO2 (c) ozone gas (d) none [1]
 5. What is smog? How is it formed? [1]
 6. Why water is so important in life? [2]
 7. How does living organism help in the erosion of rocks? [2]
 8. How is rain formed? [2]
 9. Discuss the oxygen cycle in atmosphere? [2]
 10. What is the difference between the atmospheres of the earth and atmosphere of Venus and Mars? [3]
 11. What is air pollution? How does it lead to acid rain? [3]
 12. Why is CO2 so important for life on earth? What are the two ways by which it is fixed on earth? [3]

                       CLASS - IX Science (Natural resources)
                                       WORKSHEET-2

 1. Which of the following is present abundantly in air?
 (a) Nitrogen (b) Oxygen (c) CO2 (d) Water [1]
 2. The regions of earth from outside to inside is:-
 (a) Core, mantle, and crust (b) Core, crust, and mantle (c) crust, mental, and core (d) mantle, core, and crust [1]
 3. Which layer is topmost layer from earth’s surface?
 (a) Troposphere (b) Stratosphere (c) Mesosphere (d) Thermosphere [1]
 4. The process by which O2 gets converted to CO2 is:-
 (a) Photosynthesis (b) Breathing (c) Respiration (d) Both (a) and (b) [1]
 5. What is atmosphere? What are its different regions? [1]
 6. What are biogeochemical cycles? [2]
 7. Why is life possible on earth? [2]
 8. Why do terrestrial life forms require fresh water? [2]
 9. How does atmosphere control the climate? [2]
 10. Write in detail what happens when water gets polluted. [3]
 11. Discuss the nitrogen cycle in nature? [3]
 12. What is greenhouse effect? What would happen if the level of CO2 in air would increase? [3]

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