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प्रश्न
Why is the atmosphere essential for life?
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उत्तर
The atmosphere is essential for life because it maintains an appropriate climate for the sustenance of life by carrying out the following activities:-
(i) Atmosphere keeps the average temperature of the Earth fairly constant during day time.
(ii) It prevents a sudden increase in temperature during day time.
(iii) It also slows down the escape of heat from the surface of the Earth into outer space during night time.
(iv) It contains all the important gases which are required for sustaining life on earth.
These gases are :-
(a) Oxygen for respiration of living organisms and oxidation.
(b) Carbon dioxide for photosynthesis in plants and for making food.
(c) Nitrogen for providing inert atmosphere and making proteins.
(iv) The stratosphere region (16-23 km from the surface of Earth) of atmosphere contains a thick layer of ozone which filters the harmful UV radiation from Sun. If these radiations reach on the surface of Earth, then they may cause cancer in animals and are also harmful for plants.
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संबंधित प्रश्न
List any three human activities that you think would lead to air pollution.
Give one use for the following inert gase :
krypton
State one method by which :
- Oxygen is added to air
- Carbon dioxide is added to air
- Oxygen is removed from the air
- Carbon dioxide is removed from the air
Give reasons to support the fact that air is a mixture.
Describe the major components of air pollution.
Why is air called a mixture? Give five facts in support of your answer.
State its role in warming the earth’s environment and in excess resulting in global warming.
Analogy
78% of air: Does not support combustion:: _____: Supports combustion
______ gas is filled in tyres of vehicles.
Marked temperature changes in the aquatic environment can affect
