KVPY SB SX Exam 2011 Question Paper

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Question : 63 of 120

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A person has difficulty in breathing at higher altitudes because

oxygen is likely to diffuse from lungs to blood.
oxygen is likely to diffuse from blood to lungs.
partial pressure of $O_2$ is lower than partial pressure of $CO_2$ .
overall intake of $O_2$ by the blood becomes low.

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