Q. Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
A) maintenance of the hypertrophical endometrial lining
B) maintenance of high concentration of sex hormones in the blood stream
C) retention of well-developed corpus luteum
D) fertilisation of the ovum
Explanation
[Solution from source] Absence of menstruation in a regularly cycling woman is most likely due to pregnancy, which starts with fertilisation of the ovum. The retained corpus luteum, high hormone levels and thick endometrium are consequences of fertilisation, not its root cause. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.