Which of the following depicts the site of impantation of blastocyst under normal condition?

$A$ : Fertilin protein is present in the egg membrane.
$R$ : It helps in agglutination reaction

Umbilical cord in mammals, contains

A phenomenon of embryonic induction was first described in amphibia by

Identify the hormones that are secreted in large amount prior to ovulation :

$A.$ $LH$

$B.$ $FSH$

$C.$ $Estrogen$

$D.$ $Progesterone$

Cleavage divisions differ from normal mitotic divisions in that