Number of sperms present in a single ejaculation of semen contains

Pseudopregnancy is a physiological condition comparable to normal pregnancy except that there is no

The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for

Which of the following enzyme helps sperm to penetrate zona pellucida?

$A$ : Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$ : The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage

Location and secretion of leyding cells are