Assertion :Endostyle is present at the pharyngeal groove of the mid ventral wall of the pharynx of Amphioxus. Reason: Endostyle has an important role in respiration.

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 C Assertion is correct but Reason is incorrect
In the mid ventral wall of pharynx is a shallow groove called endostyle. The endostyle is lined with gland cells which secrets mucus. The larval endostyle is lost during metamorphosis of lamprey, it contributes to the formation of a thyroid gland in the adult. Like thyroid it concentrates radioactive iodine in itself. Similar endostyle is found in urochordate and the accommodate
larva of lampreys.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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