$A$ – Acrosome possesses mitochondria.

$R$ -Middle piece of sperm is filled with enzymes

The figure given below shows the sectional view of ovary. Select the option which gives correct identification of marked structure ( $A$ to $D$ ) and its feature.

Androgen stimulates the $…A…$ FSH acts on the $…B…$ and stimulates factors for spermiogenesis. Here $A$ and $B$ refers to

Oogenesis comprises

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