Given below are two statements: 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:
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is NOT the correct explanation of A
- CA is true but R is false
- DA is false but R is true
Solution & Step-by-step Explanation
1. Assertion A is true: The blastocyst embeds itself into the thickened uterine lining (endometrium).2. Reason R is true: If fertilization doesn't occur, progesterone levels drop as the corpus luteum dies, leading to the shedding of the endometrium (menstruation).While both are true, the degeneration of the endometrium in the absence of pregnancy (R) does not explain why it is necessary for implantation (A).