Which of the following events is not associated with ovulation in human female?

Correct option is D

Ans. (d)

Sol. A decrease in estradiol is not associated with ovulation. Estradiol levels rise significantly before ovulation, promoting the LH surge that triggers ovulation. After ovulation, estradiol levels decline as the ruptured follicle transforms into the corpus luteum, which primarily secretes progesterone. Thus, estradiol decline occurs after ovulation and not during the ovulatory process.

Explanation of other options:

(a) Full development of Graafian follicle – The Graafian follicle reaches full maturity just before ovulation and is necessary for the release of a healthy oocyte. Its development ensures that the follicle is ready to rupture and release the secondary oocyte.

(b) Release of secondary oocyte – Ovulation is defined by the release of a secondary oocyte from the ruptured Graafian follicle. This event is critical for fertilization to occur if sperm are present.

(c) LH surge – The LH surge is the key hormonal trigger for ovulation. It causes the mature Graafian follicle to rupture and release the oocyte, marking the transition from the follicular phase to the luteal phase of the menstrual cycle.