To reduce the weight of the spermatozoan and enhance its motility,the nucleus undergoes which of the following changes?

Given below are two statements :
Statement-$I$ : Each primary oocyte gets surrounded by a layer of granulosa cells and is called a primary follicle.
Statement-$II$ : At puberty,only $60,000-80,000$ primary follicles are left in each ovary.
In the light of the above statements,choose the most appropriate answer from the options given below :

Draw a labeled diagram of a Graafian follicle.

Telolecithal eggs have

Spermatogonia undergo ....... to produce spermatozoa.

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