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Standard IX
Biology
Air and Its Composition
Question

As we go up the layers of the atmosphere, the pressure ________.
  1. Increases
  2. Decreases
  3. Remains the same
  4. All of these

A
Increases
B
Remains the same
C
All of these
D
Decreases
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Solution
Verified by Toppr

  • The weight of the atmosphere acts as a force upon the underlying surface of the Earth. The amount of force exerted over an area of the surface is called atmospheric pressure or air pressure.
  • In the atmosphere, the air pressure at any point is caused by the weight per area of the air above that point.
  • As we go up the layers of the atmosphere, fewer air molecules are above us. So, there will be less weight of air above us. Hence, atmospheric pressure always decreases as we move upward in the atmosphere.
Thus, option D is correct.

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Similar Questions
Q1
As we go up the layers of the atmosphere, the pressure ________.
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Q2
Consider the following statements.
1. Amount of insolation increases from equator towards poles.
2. As we go up the layers of atmosphere, the pressure falls rapidly.
3. Horizontally the distribution of air pressure is influenced by temperature of air at a given place.
Which of the following statements is/are correct?
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Q3
As we go up in the air, the atmospheric pressure _________.
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Q4
How does the atmospheric pressure vary as we go up?
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Q5

Tick the correct answer.

(i) Which of the following gases protects us from harmful sun rays?

(a) Carbon dioxide

(b) Nitrogen

(c) Ozone

(ii) The most important layer of the atmosphere is

(a) Troposphere

(b) Thermosphere

(c) Mesosphere

(iii) Which of the following layers of the atmosphere is free from clouds?

(a) Troposphere

(b) Stratosphere

(c) Mesosphere

(iv) As we go up the layers of the atmosphere, the pressure

(a) Increases

(b) Decreases

(c) Remains the same

(v) When precipitation comes down to the Earth in the liquid form, it is called

(a) Cloud

(b) Rain

(c) Snow
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