Question

If mammalian ovum fails to get fertilized, which one of the following is unlikely to happen?

• A. Corpus luteum will disintegrate.
• B. Progesterone secretion rapidly declines.
• C. Estrogen secretion further decreases.
• D. Primary follicle starts developing.

Answer 1

The correct option is C Estrogen secretion further decreases.

• If pregnancy occurs, human chorionic gonadotropin is released maintaining the corpus luteum allowing it to maintain levels of progesterone. In the other way round, (i.e., in case fertilization does not occur), progesterone levels fall due to the disintegration of the corpus luteum.
• The primary follicle is a precursor to the corpus luteum and thus this is most unlikely to happen. At the start of the menstrual cycle, some 12-20 primary follicles begin to develop under the influence of elevated FSH to form secondary follicles.
• The primary follicles have formed from primordial follicles, which developed in the ovary at around 10-30 weeks after conception.

Therefore, the correct answer is option C.