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 from the options given below:
- A
Both A and R are true and R is the correct explanation of A.
- B
Both A and R are true but R is NOT the correct explanation of A.
- C
A is true but R is false.
- D
A is false but R is true.
The blastocyst implants into the prepared uterine lining — Assertion is correct. The Reason is also true (without fertilisation, corpus luteum regresses, progesterone falls, endometrium sheds). However R describes what happens in the absence of fertilisation, so it does not directly explain why endometrium is needed for implantation. Both true, R not the correct explanation.
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