Which of the following best describes the sequence of hormonal events that leads to ovulation during the follicular phase?

medium MCQ 2 marks Class 12 · Biology · Human Reproduction

A) Rising FSH → Follicle growth → Increased estradiol → LH surge → Ovulation
B) Rising LH → Follicle growth → Increased progesterone → FSH surge → Ovulation
C) Rising FSH → Follicle growth → Increased progesterone → LH surge → Ovulation
D) Rising LH → Follicle growth → Increased estradiol → FSH surge → Ovulation

Answer

A) Rising FSH → Follicle growth → Increased estradiol → LH surge → Ovulation

The correct answer is A) Rising FSH → Follicle growth → Increased estradiol → LH surge → Ovulation — Option A correctly lists these events in chronological order.

Step-by-step solution

Identify the key hormones involved: Follicle Stimulating Hormone (FSH), Estrogen (estradiol), Luteinising Hormone (LH).
During the early follicular phase, $F S H$ released from the pituitary promotes growth of ovarian follicles.
As the dominant follicle matures, it secretes increasing amounts of $es t r a d i o l$ .
High $es t r a d i o l$ levels eventually trigger a positive feedback loop that causes a sudden rise in $L H$ (the LH surge).
The $L H$ surge induces the breakdown of the follicle wall and release of the oocyte (ovulation).
Option A correctly lists these events in chronological order.

Common mistake: Confusing the order of

L H

and

F S H

rise

Concept tested: Follicular hormonal sequence

Published 24 September 2026 · How this solution was prepared and checked

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