Question

The given figure shows a sectional view of a seminiferous tubule. Identify the parts labelled as A, B, C, D and E.

• A. A- Spermatogonium, B- Sertoli cells, C- Primary spermatocyte, D- Secondary spermatocyte, E- Spermatozoa
• B. A- Sertoli cells, B- Spermatogonium, C- Primary spermatocyte, D -Secondary spermatocyte, E- Spermatozoa
• C. A- Sertoli cells, B- Spermatogonium, C- Primary spermatocyte, D- Secondary spermatocyte, E- Spermatids
• D. A - Sertoli cells, B-Spermatozoa, C- Secondary spermatocyte, D -Primary spermatocyte, E - Spermatids

Answer 1

The correct option is A A- Spermatogonium, B- Sertoli cells, C- Primary spermatocyte, D- Secondary spermatocyte, E- Spermatozoa

A-Spermatogonium: These are the diploid cells present on the inside wall of seminiferous tubules that are formed by multiple mitotic division of primordial germ cells.

B-Sertoli cells: These are the somatic cells of the testis. They are larger columnar cells that provide nutrition to the progressing germ cells to spermatozoa.

C-Primary spermatocytes: Some spermatogonia grow in size by obtaining nutrition from nursing cells to form primary spermatocytes.

D-Secondary spermatocytes: Primary spermatocytes undergo first maturation division (reductional division) by meiosis creating haploid secondary spermatocytes.
E-Spermatozoa(sperms): The second round of maturation division (equational division) occurs in the secondary spermatocytes giving rise to four haploid spermatids.The haploid cells produced in the second round of maturation division (i.e., spermatids), by the process of spermiogenesis, transformed into mature spermatozoa.