Where is morula formed in human? Explain the process of its development from the zygote.

Explain the process of making yarn from fibre.

Explain the process of oogenesis in human being.

When and where are primary oocytes formed in a human female? Trace the development of these oocytes till ovulation (in menstrual cycle). How dogonadotropins influence this developmental process?

Explain the process of spermatogenesis in human being.

What will be the sex of an offspring developing from 44A + XX zygote?

What will be the sex of the offspring developing from 44A + XY zygote?

Where is acrosome present in humans ? write its function.

Explain how a frog protects itself from its enemies?