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Solution


Q.

Given below are two statements.                                                                                                   [2023]
One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Endometrium is necessary for implantation of blastocyst.
Reason (R): In the absence of fertilization, the corpus luteum degenerates that causes disintegration of endometrium.

In the light of the above statements, choose the correct answer from the options given below:
1 (A) is true but (R) is false.  
2 A is false but (R) is true.  
3 Both (A) and (R) are true and (R) is the correct explanation of (A).  
4 Both (A) and (R) are true but (R) is not the correct explanation of (A).  

Ans.

(4)

The corpus luteum secretes large amount of progesterone which is essential for maintenance of the endometrium. This endometrium is necessary for implantation of the fertilised ovum (blastocyst). In the absence of fertilisation the corpus luteum degenerates. This causes disintegration of the endometrium leading to menstruation, marking a new cycle.