Explain the events that follow up to fertilisation when the sperms come in contact with the ovum in the fallopian tube of a human female.

Given below is a flow chart showing ovarian changes during menstrual cycle. Fill in the spaces with the hormonal factor(s) responsible for the events shown.

Name the hormones involved in regulation of spermatogenesis.

The doctor could hear the heartbeats in a foetus. How many days of gestation period must have passed?

How does zona pellucida of ovum help in preventing polyspermy?

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

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

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

Except endocrine function, what are the other functions of placenta.

Mark the odd one in each series.

1. Scrotum, rete testis, Fallopian tube, vas deferens.
2. Ovary, uterus, vagina, ejaculatory duct.
3. Prostate, testis, seminal vesicles, Cowper's gland.
4. Fallopian tubes, vagina, uterus, ovaries.