Question

Assertion In earthworn, setae are formed by a horny nitrogenous organic substance.
Reason. Setae are present in persitomiun, pygidium and clitellum only.
A. Both Assertion and Reason are ture and Reason is the correct explanation of Assertion.
B. Both Assertion and Reason are true, but Reason is not correct explanation of Assertion
C. Assertion is true, but Reason is false
D. Assertion is false, but Reason is true.

Answer 1

Correct Answer - C
In the middle of each segment of earthworm, there is a ring tiny curved bristles called setae or chaetae. This is formed of horny nitrogenous organic substance known as chitin. Setae are 80 th - 120 th in each segment except in peristomium, pygidium and the clitellum. These help in locomotion in association with musculature of body wall.