c)
vapour
d)
2
8. Whi
Carbon dioxide is important for the living
world because
a) plants use it for photosynthesis
b) animals use it for photosynthesis
c) plants use it for respiration
d) animals use it for respiration
3. During combustion,
(i) nitrogen is consumed
(iii) carbon dioxide is formed
(ii) oxygen is consumed
(iv) oxygen is formed
a) (i) and (ii)
c) (ii) and (iv)
b) (i) and (iii)
d) (ii) and (iii)
4. Respiration is a form of
a) combustion
c) rusting
b) photosynthesis
d) humidity
5. Oxygen is used in
a) respiration only
b) photosynthesis
c) pollution
d) respiration and combustion
6. The oxygen cycle is threatened by
a) planting trees
a) deforestation
c) photosynthesis
d) respiration
7 . the maximum amount of pollution in air can be found
a) over high mountain ranges
b) on high seas , away from land
c) in cities and industrial towns
d) over large farmlands
8. which statements are not true about air?
i) air is a mixture of gases.
ii) accident makes up 50% of air.
iii) air contains water vapour.
iv) air contains very little nitrogen.
a) i) and ii) b) i) and iii) c) ii) and iv) d) ii) and iii) .
9. water is found in the air in the form of
a) dust
b) ice
c) water vapour
d) carbon
10. which one of the following harms the air ?
a) evaporation
b) pollution
c) condensation
d) precipitation
Answers
Answered by
8
Answer:
- a)
- a)
- a)
- d)
- b)
- c)
- c)
- c)
- b)
Explanation:
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