Archenteron is formed during

$A$ : Blastocyst undergoes gastrulation to produce the three germinal layers.
$R$ : This involves cell movements (morphogenetic movement) that eventually help to attain new shape and morphology of embryo

Bartholin glands are also called

In human females at the time of birth there are two million ova: how many of them normally reach maturity in the course of normal reproductive life

External stimulus which induces cleavage in an unfertilized ovum is called