Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Yolk sac
Amnion
Chorion
Allantosis
$A$ : In frog gray cresent is formed during fertilization.
$R$ : It is because the black granules move towards the point of entry of the sperm in animal half
The yolk plug is a structure in gastrula which is formed by the protrusion of
Inhibition of uterine contraction ceases and the bleeding and cramps of menstruation begin due to
Sertoli cells are found in
Heterogametic male condition does not occur in