Assertion :Bacteria that reach the lungs rarely survive. Reason: Alveoli of normal lungs are lined by a film of lecithin which kills the bacteria.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Lecithin is the substance that is produced in the lungs. It regulates the surface tension of fluid in lungs. It increases resistance to disease by killing the bacteria. When bacteria reach the lungs, they rarely survive because of the presence of lecithin film on the lining of alveoli of lungs.
Thus, the correct answer is option A.

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