Question

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 but R is NOT the correct explanation of A.
• B. A is true but R is false.
• C. A is false but R is true.
• D. Both A and R are true and R is the correct expiation of A

Answer 1

Answer: (A)

Both A and R are true but R is NOT the correct explanation of A.

Answer 2

• Assertion A is true: The endometrium is indeed necessary for the implantation of the blastocyst, which is the early stage of embryo development.
  • Reason R is also true: In the absence of fertilization, the corpus luteum, which forms from the ovarian follicle after ovulation, degenerates. This leads to a decrease in the levels of progesterone, which is essential to maintain the endometrial lining. Without sufficient progesterone, the endometrial lining undergoes disintegration and is shed during menstruation.

While both statements A and R are true, Reason R does not directly explain why the endometrium is necessary for implantation of the blastocyst. The role of the corpus luteum and the disintegration of the endometrium is related to the menstrual cycle and the absence of pregnancy, but it doesn't directly address the role of the endometrium in blastocyst implantation. Therefore, the correct answer is that both A and R are true, but R is not the correct explanation of A.

Therefore, the correct option is (A): Both A and R are true but R is NOT the correct explanation of A.