Assertion :Symptoms of emphysema develops when a person living on plains ascends and stays on a mountain. Reason: Air pressure and partial pressure of oxygen falls with the rise in altitude.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is D Assertion is incorrect but Reason is correct.
At high altitudes (3500 mts and above), there is decrease in atmospheric pressure as well as oxygen content of atmosphere. Reduced atmospheric pressure reduces the amount of air taken into the lungs during inspiration. Emphysema is a permanent abnormal pathological inflation of air spaces distal to terminal bronchioles, due to destruction of pulmonary tissue especially alveolar septa and flattening of alveolar ducts.

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Choose the correct option.

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