The layer of cells immediately surrounding the ovum but outside the zona pellucida is called:

Which part of the sperm helps in penetrating the egg membrane?

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is

What is the number of sperms present in a single ejaculation of semen?

Which gland's hormones are essential for the process of spermiogenesis during sperm formation?

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 :