Arrange the given structures involved in spermatogenesis in correct s…

The correct answer is Option (4) → C, D, A, B

C. Spermatogonia — first. These are the diploid male germ cells on the inner wall of the seminiferous tubules. They multiply by mitosis. Some of them grow into primary spermatocytes, which undergo meiosis.

D. Secondary spermatocytes — second. The first meiotic division of a primary spermatocyte gives two equal haploid secondary spermatocytes, each with 23 chromosomes.

A. Spermatids — third. The second meiotic division of the secondary spermatocytes gives four haploid spermatids in all.

B. Spermatozoa — last. The spermatids change shape and become spermatozoa (sperms). This change is called spermiogenesis.

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NCERT Extract:
Gametogenesis – “… In testis, the immature male germ cells (spermatogonia) produce sperms by spermatogenesis that begins at puberty. The spermatogonia (sing. spermatogonium) present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes. Some of the spermatogonia called primary spermatocytes periodically undergo meiosis. A primary spermatocyte completes the first meiotic division (reduction division) leading to formation of two equal, haploid cells called secondary spermatocytes, which have only 23 chromosomes each. The secondary spermatocytes undergo the second meiotic division to produce four equal, haploid spermatids (Figure 2.5). … The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis.”