Question

The number of spermatozoa, a single primary spermatocyte finally produced in spermatogenesis is
(a) 2
(b) 4
(c) 6
(d) 8

Answer 1

Hint:
Sperms are produced by spermatogenesis within the seminiferous tubules. Primordial germ cells called spermatogonia present in the seminiferous tubule divide by mitosis. Some of these cells enter meiosis l to become primary spermatocytes; they then complete meiosis l to become secondary spermatocytes. The secondary spermatocytes then complete meiosis ll to become spermatids, which differentiate into spermatozoa(sperms) and are released into the lumen of the tubule.

Complete step by step answer:
Within the seminiferous tubules, interspersed with spermatogonia, there are big cells that start from the margin of the tubule to the lumen. These cells are the Sertoli's cells, which support and nourish other cells. Sertoli cells help in phagocytosing residual bodies which are discarded in the process of differentiation into spermatozoa out of most of the spermatid cytoplasm.
Spermatogenesis also depends on the testosterone secreted by Leydig cells, located between the seminiferous tubules. The process of spermatogenesis is completed by about 300 million sperm daily.
First of all, there is a primordial germ cell present that enters the gonad and forms spermatogonium. After this diploid spermatogonia divide by mitosis in testes. When the primary spermatocyte completes the first meiotic division then it forms two secondary spermatocytes. When these secondary spermatocytes enter meiotic division ll it forms four spermatids that undergo differentiation and form four mature sperms.

Option ‘B’ is correct

Note:
The second division of meiosis is completed by secondary spermatocytes formed by the first meiotic division of the primary spermatocyte. Spermatids are the haploid cells formed. The spermatids differentiate into sperm cells