Question

Given below is the schematic representation of spermatogenesis in human males:

Choose the option that shows the correct labelling of ‘I’, ‘II’, ‘III’ and ‘IV’ in the given diagram.

Options

• I - spermatozoa, II - spermatid, III - sec. spermatocyte, IV - spermatogonia

• I - spermatid, II - spermatogonia, III - sec. spermatocyte, IV - spermatozoa

• I - spermatogonia, II - sec. spermatocyte, III - spermatozoa, IV - spermatid

• I - spermatogonia, II - sec. spermatocyte, III - spermatid, IV - spermatozoa

Answer 1

I - spermatogonia, II - sec. spermatocyte, III - spermatid, IV - spermatozoa

Explanation:

Spermatogenesis follows these stages:

1. Spermatogonia (I): Diploid stem cells that divide by mitosis.
2. Secondary Spermatocyte (II): Undergoes Meiosis II to form spermatids.
3. Spermatids (III): Differentiate into mature spermatozoa (sperm).
4. Spermatozoa (IV): Mature male gametes are called spermatozoa or sperm.

Thus, the correct labelling is:

I: Spermatogonia

II: Secondary Spermatocyte

III: Spermatid

IV: Spermatozoa