Class 7 Science - Chapter Respiration in Organisms NCERT Solutions | The mountaineers carry oxygen with them

Welcome to the NCERT Solutions for Class 7th Science - Chapter Respiration in Organisms. This page offers a step-by-step solution to the specific question from Excercise ".$ex_no." , Question 9: the mountaineers carry oxygen with them because....
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.

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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