Question 9
The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.
(b) The amount of air available to a person is less than that available on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.

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Solution

The answer is : (b) The amount of air available to a person is less than that available on the ground.
At sea level, the atmospheric pressure is greater than the pressure in the lungs, and oxygen molecules can diffuse more easily into the bloodstream. Air pressure decreases with increase in altitude. The amount of oxygen that is available or that can diffuse easily into the bloodstream decreases. So mountaineers carry oxygen with them .

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