Q. About which day in a normal human menstrual cycle does rapid secretion of LH (popularly called LH-surge) normally occur?
A) 5th day
B) 11th day
C) 14th day
D) 20th day
Explanation
[Solution from source] In a 28-day cycle, LH rises to a peak (the LH surge) around the middle of the cycle, about day 14, and this surge triggers ovulation. Days 5 and 11 fall in the follicular phase and day 20 in the luteal phase. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.