NEETZoologyHuman Reproduction
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): In human males, a significant increase in the secretion of GnRH at puberty initiates the process of spermatogenesis. Reason (R): GnRH acts on the anterior pituitary gland to release LH and FSH, which directly act on male germ cells (spermatogonia) to induce meiosis. In the light of the above statem
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
C. (A) is true but (R) is false
Step-by-step solution
Assertion (A) is true because spermatogenesis begins at puberty due to a significant increase in the secretion of gonadotropin releasing hormone (GnRH) from the hypothalamus. Reason (R) is false because LH and FSH do not act directly on male germ cells. LH acts on the Leydig cells (interstitial cells) to stimulate synthesis and secretion of androgens, while FSH acts on the Sertoli cells to stimulate secretion of factors which help in spermiogenesis. It is the androgens that stimulate the process of spermatogenesis.