Animal Kingdom Question 736
Question: 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.
Options:
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
Show Answer
Answer:
Correct Answer: C
Solution:
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 redioactive iodine in itself.
Similar endostyle is found in urochordate and the ammocoete larva of lampreys.
BETA
