Question

In the menstrual cycle, the LH surge is primarily responsible for:

• A. Formation of endometrium
• B. Menstruation
• C. Ovulation
• D. Degeneration of corpus luteum

Hint:

LH Surge = Ovulation. This direct association is frequently asked in CUET and NEET examinations.

Answer 1

The Correct Option is C

Concept: Luteinising Hormone (LH) and Follicle Stimulating Hormone (FSH) are secreted by the anterior pituitary gland and regulate the ovarian cycle.

Step 1: Understanding LH surge.
During the middle of the menstrual cycle, estrogen secretion from the Graafian follicle increases significantly. This high estrogen level stimulates the pituitary gland to release a large quantity of LH suddenly. This sudden increase is called the: \[ \text{LH Surge} \]

Step 2: Role of LH surge.
The LH surge causes:

• Rupture of mature Graafian follicle
• Release of ovum from ovary
• Formation of corpus luteum

Step 3: Identifying the biological process.
Release of ovum from ovary is known as: \[ \text{Ovulation} \]

Step 4: Eliminating incorrect options.

• Formation of endometrium is mainly influenced by estrogen.
• Menstruation occurs when progesterone levels fall.
• Degeneration of corpus luteum occurs if fertilisation does not happen.

Hence, ovulation is the correct answer.