Statement I: Mountaineers carry oxygen cylinders with them when they climb high mountains.

Statement II: Layer of air gets thinner at higher altitudes and breathing becomes difficult.

Statement I is True and Statement II is the correct explanation.

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Statement I is True and Statement II is not the correct explanation.

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Statement I is True and Statement II is False.

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Statement I is False and statement II is True.

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Solution

The correct option is A
Statement I is True and Statement II is the correct explanation.

Although the percentage of oxygen in the air is constant at different altitudes, atmospheric pressure decreases with increase in altitude. This means that the layer of air at heights gets thinner and the number of oxygen molecules available per breath decreases. Hence, to avoid suffocation, mountaineers carry oxygen cylinders.

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