Assertion :Ear muscles of the external ear in man are poorly developed. Reason: These muscles are useful which move external ear freely to detect sound efficiently.

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 C Assertion is correct but reason is incorrect.
The external ear in humans is a vestigial organ and is poorly developed. It comprises of pinna or auricle whose muscles are useless as in many mammals these muscles are used to move their pinnae to collect the sound waves and focus their hearing in a certain direction. Such function is absent in human pinna. It is just protective and increases the efficiency of hearing.
Thus, the correct answer is option C.

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