The concept that organiser is essential for embryonic development was given by or For the ‘Theory of organiser’, Nobel prize was given to

Which of these is used to control human population?

In female mammals Bartholin's glands open into the

Blood flowing in umbilical cord is

$A$ : 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