NEET · Biology · STD 12 - 2. human reproduction

Select the correct option describing gonadotropin activity in a normal pregnant female.

A High level of \(FSH\) and \(LH\) stimulates the thickening of endometrium.
B High level of \(FSH\) and \(LH\) facilitates implantation of the embryo.
C High level of \(hCG\) stimulates the synthesis of estrogen and progesterone.
D High level of \(hCG\) stimulates the thickening of endometrium.

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Answer & Solution

Correct Answer

(C) High level of \(hCG\) stimulates the synthesis of estrogen and progesterone.

Step-by-step Solution

Detailed explanation

(c) : The trophoblastic cells secrete human chorionic gonadotropin hormone which has properties similar to those of lutenizing hormone \((LH)\) of the pituitary gland. It takes over the job of pituitary \(LH\) during pregnancy. The \(hCG\) maintains the corpus luteum and stimulates it to secrete progesterone. The latter maintains the endometrium of the uterus and causes it to grow throughout pregnancy. This also prevents menstruation. Progesterone also causes increased secretion of mucus in the cervix of the uterus that forms a protective plug during pregnancy.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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