Which of the following statements are correct with respect to reproduction in human?
A. Menstrual cycle ceases during pregnancy
B. Leydig cells found in ovary provide nourishment to the fertilized egg
C. Androgens are produced by sertoli cells
D. Zona pellucida is a membrane covering secondary oocyte
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A, D only
A. Menstrual cycle ceases during pregnancy — Correct. The corpus luteum keeps secreting progesterone and the placenta takes over, so the endometrium is kept and no menstruation occurs.
B. Leydig cells found in ovary provide nourishment to the fertilized egg — Incorrect. Leydig cells lie in the testis and secrete androgens. The early embryo is nourished through the placenta later.
C. Androgens are produced by sertoli cells — Incorrect. Androgens come from the Leydig (interstitial) cells. Sertoli cells nourish the developing sperms.
D. Zona pellucida is a membrane covering secondary oocyte — Correct. The secondary oocyte in the Graafian follicle forms a new membrane, the zona pellucida, around itself.