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

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

With the increase in altitude, the amount of oxygen in air decreases. This lack of oxygen may cause suffocation to mountaineers when they reach high altitudes. So, to prevent suffocation, mountaineers carry oxygen with them.

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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.

State whether the following statements are true/ false .Give the explanation for each statement to support your answer. [5 MARKS]
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(2) Plants carry out photosynthesis only during the day and respiration only at night.
(3) Frogs breathe through their skins as well as their lungs.
(4) The amount of air available on the mountains is more than that available on the ground.
(5) Glucose breaks down into lactic acid in the absence of oxygen.

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