One of the minute cell which separates from the animal egg during maturation is known as

Given below are two statements :

Statement $I$ :

The release of sperms into the seminiferous tubules

is called spermiation.

Statement $II$ :

Spermiogenesis is the process of formation of sperms from spermatogonia.

In the light of the above statements, choose the most appropriate answer from the options given below:

$A$ – Acrosome possesses mitochondria.

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

Which of the following phase in development of a sperm has no counterpart in development of an ovum

Primary spermatocyte differs from spermatogonium in