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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