Statement I: Increased levels of GnRH stimulate the secretion of luteinising hormone (LH) and follicle stimulating hormone (FSH) from the anterior pituitary gland.
Statement II: LH acts at the Sertoli cells and stimulates synthesis and secretion of androgens.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Only statement I is correct.
Statement I — True. At puberty the hypothalamus releases more GnRH (gonadotropin releasing hormone). GnRH acts on the anterior pituitary, which then secretes the two gonadotropins, LH and FSH.
Statement II — False. LH acts on the Leydig cells, not the Sertoli cells. Leydig cells lie between the seminiferous tubules and make androgens. FSH is the hormone that acts on the Sertoli cells.
NCERT Extract:
Gametogenesis – “… Spermatogenesis starts at the age of puberty due to significant increase in the secretion of gonadotropin releasing hormone (GnRH). This, if you recall, is a hypothalamic hormone. 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.”