Sperms are released from the seminiferous tubules by the process called …..

Which of the following labelled parts produces energy for the movement of the tail that facilitate sperm motility essential for fertilisation?

Hysterectomy is surgical removal of

$A$ : In human, ovum is alecithal type.
$R$ : It is almost free of yolk

The undifferentiated primordial germ cells are larger in size and their chromatin rich nuclei are distinct in