The mountaineers carry oxygen with them because.

At an altitude of more than

5

km there is no air

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The amount of air available to a person is less than that available on the ground

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The temperature of air is higher than that on the ground

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The pressure of air is higher than that on the ground

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Solution

The correct option is C i.e The amount of air available to a person is less than that available on the ground
The atmospheric pressure decreases as we go up above sea level, and the amount of oxygen also decreases at higher altitudes which leads to mountain sickness, a condition where the body experiences a shortage of oxygen or hypoxia in the tissues at high altitudes, respiratory problems such as breathlessness, it can cause headaches, irritability, fatigue, weakness, lack of sleep, etc.
So, to prevent this situation a mountaineer requires a source of oxygen and hence the oxygen tank.

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Similar questions

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.

(d) The pressure of air is higher than that on the ground.

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