FSH acts on the -

The correct answer is Option (2) → Sertoli cells

At puberty, GnRH from the hypothalamus makes the anterior pituitary release two gonadotropins, LH and FSH. The two act on different cells of the testis. LH acts on the Leydig cells, and FSH acts on the Sertoli cells.

(1) Leydig cells — Incorrect. LH, not FSH, acts on the Leydig cells. It makes them secrete androgens, which in turn drive spermatogenesis.

(2) Sertoli cells — Correct. FSH acts on the Sertoli cells in the seminiferous tubules. They then secrete some factors that help in spermiogenesis.

(3) Stem cells — Incorrect. FSH does not act on stem cells. The germ cells that form sperms are the spermatogonia.

(4) Spermatids — Incorrect. Spermatids are not the target of FSH. They are changed into sperms by spermiogenesis, which the factors from the Sertoli cells only help.

NCERT Extract:
Gametogenesis – “… LH acts at the Leydig cells and stimulates synthesis and secretion of androgens. Androgens, in turn, stimulate the process of spermatogenesis. FSH acts on the Sertoli cells and stimulates secretion of some factors which help in the process of spermiogenesis.”