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Class 7
Science
Respiration in Organisms
the mountaineers carry oxygen with them because...

Question:
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.

Answer:

(b) The amount of air available to a person is less than that available on the ground.

The mountaineers carry oxygen cylinders with them because as they go higher the amount of oxygen level decreases in the air. They carry oxygen because the amount of air available to a person is less than that available on the ground.

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