Spermatogenesis
Read the following passage carefully and answer the given questions.
As you are aware, humans are sexually reproducing and viviparous. The reproductive events in humans include formation of gametes (gametogenesis), i.e., sperms in males and ovum in females. Male reproductive system is composed of a pair of testes, the male sex accessory ducts, accessory glands, and external genitalia. Each testicular lobule contains one to three highly coiled seminiferous tubules in which sperms are produced. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells. The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Leydig cells. The male sex accessory ducts include rete testis, vasa efferentia, epididymis and vas deferens. The male accessory glands include paired seminal vesicles, a prostate and paired bulbourethral glands. Secretions of these glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes.
In human males, LH and FSH are released by:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Pituitary
The hormones of the testis are controlled in steps. The hypothalamus releases GnRH. GnRH acts on the anterior pituitary, which then releases two gonadotropins, LH and FSH. These act on the testis.
(1) Hypothalamus — Incorrect. It releases GnRH, which controls the release of LH and FSH. It does not release LH or FSH itself.
(2) Testis — Incorrect. It is the target of LH and FSH. The Leydig cells of the testis make androgens.
(3) Pituitary — Correct. The anterior pituitary secretes LH and FSH.
(4) Prostate — Incorrect. It is an accessory gland that adds to the seminal plasma, and it makes no gonadotropins.
Note: The passage is taken from NCERT. NTA has put lines of the NCERT text together to make it. Most CUET (UG) questions come straight from NCERT, so study the book line by line, including figures and their titles.
NCERT Extract:
Gametogenesis – …
