Question

Given above is an incomplete flow chart showing the influence of hormones on gametogenesis in males. Observe the flow chart carefully and identity A, B, and C.

a. A- Progesterone, B- Follicular, C- Spermatogenesis
b. A- GnRH, B- Follicular, C- Spermatogenesis
c. A- GnRH, B- Sertoli, C- Spermatogenesis
d. A- Androgens, B- Sertoli, C-Spermatogenesis

Answer 1

Hint: Gametogenesis is a biological process in which cells perform meiotic division and form gametes. Hormones play a significant role in the process of gametogenesis. FSH and LH are the two hormones which influence gametogenesis. Gametogenesis is an important part of reproduction in mammals by which germ cells perform cell division and form matured gametes, the oocytes, and the spermatozoa.

Complete answer:
• A significant increase in the secretion of Gonadotropin-releasing hormone results in spermatogenesis.
• GnRH further stimulates the secretion of FSH(Follicle-stimulating hormone) and LH(Luteinising Hormone).
• Luteinizing hormone acts on Leydig cells and initiates synthesis and secretion of hormone androgens.
• The follicle-stimulating hormone acts on Sertoli cells and then further increases spermatogenesis.
• Progesterone is a female steroid hormone secreted by the ovaries.

Hence, the correct answer is option (D).

Additional information:
• Androgens are present both in males and females, and have a significant role in male traits and reproduction.
• Sertoli cells are the nurse cells that play a role in the process of spermatogenesis.
• The process of development of spermatozoa from germ cells is known as Spermatogenesis.
• FSH and LH are formed by the pituitary gland.

Note: Gametogenesis is the production of gametes i.e eggs and sperms. Formation of gametes occurs in the testis(in males) and ovaries(in females) from the germ cells. Hormones that regulate gametogenesis are called a gonadotropin. FSH regulates gametogenesis by acting on the gamete producing cells. Secretion of steroid sex hormones is stimulated by hormone-producing cells on which LH acts.