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Question

A person has difficulty in breathing at higher altitudes because.

A
Oxygen is likely to diffuse from lungs to blood
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B
Oxygen is likely to diffuse from blood to lungs
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C
Partial pressure of O2 is lower than partial pressure of CO2
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D
Overall intake of O2 by the blood becomes low
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Solution

The correct option is C Partial pressure of O2 is lower than partial pressure of CO2
At higher altitudes, the air becomes thinner hence the amount of oxygen is less. Hence, there is a decrease in atmospheric pressure as well as the oxygen content of the atmosphere resulting in a low partial pressure of oxygen than that of carbon dioxide resulting in difficulty in breathing. Thus, the correct answer is option C.

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