Question

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

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

Answer 1

The correct option is A

Estrogen secretion further decreases

If the mammalian ovum fails to fertilise - Corpus leuteum declines so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy). Also, estrogen continues to cause the growth of the endometrium which ultimately becomes thick enough to break down and cause menstruation. Hence estrogen secretion does not increase further. Primary follicles continue developing irrespective of ovulatory condition.