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Assertion : Endostyle is present at the ...

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

A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C

If the assertion is true but the reason is false

D

If both the assertion and reason are false

Text Solution

Verified by Experts

The correct Answer is:
C
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 ammocoete larva of lampreys.
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