Process of Spermatogenesis

Q.

Why does spermatogenesis begin only after puberty?

Q.

What happens to spermatogonia at puberty?

Q. Study the image related to spermatogenesis and name the hormones involved at each stage of the following flow chart.

1. 1 - GnRH, 2 - LH, 3 - Testosterone
2. 1 - LH, 2 - FSH, 3 - GnRH
3. 1 - GnRH, 2 - LH, 3 - FSH
4. 1 - FSH, 2 - LH, 3 - GnRH

Q.

Arrange the following events of spermatogenesis:

i. The spermatogonia give rise to 4 primary spermatocytes (2n)

ii. The spermatogonia divide mitotically to maintain the germ cells (2n)

iii. Spermiogenesis

iv. Each primary spermatocyte gives rise to 2 secondary spermatocytes (n)

1. iii, ii, i, iv

2. ii, i, iv, iii

3. iii, i, ii, iv

4. ii, iii, i, iv

Q.

In humans, at the end of first meiotic division, the male germ cells differentiate into

1. Primary spermatocytes

2. Spermatids

3. Spermatogonia

4. Secondary spermatocytes

Q.

Which of the following is the correct order of spermatogenesis?

1. Meiosis, Mitotic proliferation, Packaging

2. Packaging, Mitotic proliferation, Meiosis

3. Mitotic proliferation, Meiosis, Packaging

4. Only Meiosis and Packaging

Q.

The immature male germ cell undergoes division to produce sperms by the process of spermatogenesis. Choose the correct statement with reference to above.

1. Spermatogonia have 46 chromosomes and always undergo meiotic cell division

2. Primary spermatocytes divide by mitotic cell division

3. Secondary spermatocytes have 23 chromosomes and undergo second meiotic division

4. Spermatozoa are transformed into spermatids