Question

Assertion (A): In the absence of fertilisation menstruation occurs. Reason (R): The corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation. Regarding (A) and (R):

Answer 1

both assertion and reason is true and reason is the correct explaination of it

Answer 2

Assertion and reason is correct and reason is correct explanation.

Progestrone released by corpus leuteum is necessary for stabilising endometrium. If fertilisation doesn't occurs then corpus leuteum degenrates leading to instability of endometrium.