Corpus luteum in pregnancy has a long life. However, if fertilisation does not take place, it remains active only for 10-12 days. Explain.

1. State the difference between meiocyte and gamete with respect to chromosome number.
2. Why is awhiptail lizard referred to as parthenogenetic?

Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?

After implantation interdigitation of maternal and foetal tissues takes place. Identify the tissues involved and justify their role.

What is the number of chromosomes in the following cells of a human male?

1. Spermatogonial cells.
2. Spermatids.
3. Primary spermatocytes.
4. Sertoli cells.

Draw a labelled diagram of a part of the transverse section through seminiferous tubule of human testis showing the various stages of spermatogenesis.

Differentiate between primary and secondary follicles.

Write the function of each of the following:
Seminal vesicle.

Spermatogenesis in human males is a hormone regulated process. Justify.

Label a, b, c in the following diagram.