Match List - I with List - II.

Choose the correct answer from the options given below: 

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

The correct answer is Option (1) → (A)-(II), (B)-(I), (C)-(IV), (D)-(III)

A. The increased levels of GnRH then acts at the anterior pituitary gland and stimulates secretion of two gonadotropins – luteinising hormone (LH) and follicle stimulating hormone (FSH). LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis.

B. Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). This is a hypothalamic hormone.

C. The secretion of gonadotropins (LH and FSH) increases gradually during the follicular phase, and stimulates follicular development as well as secretion of estrogens by the growing follicles. Both LH and FSH attain a peak level in the middle of cycle (about 14th day).

D.The corpus luteum is a temporary endocrine structure that forms in the ovary from the remnants of the ovarian follicle after ovulation. Its primary function is to produce progesterone, a hormone crucial for preparing and maintaining the uterine lining for potential implantation of a fertilized egg (embryo). If fertilization occurs, the corpus luteum continues to produce progesterone to support early pregnancy until the placenta takes over this function. If fertilization does not occur, the corpus luteum regresses, leading to a decrease in progesterone production and triggering the start of a new menstrual cycle.