The allantois has the similar layers as present in the yolk sac. These are

The lens of the eye is derived from which germ layer?

Foetal membranes provide

Which of the following is $NOT$ true for gastrulation?

$A$ : The morula passes through the phase of compaction,producing two major types of cells: the peripheral cells and the inner cell mass.
$R$ : The descendants of the inner cell mass become the trophoblast cells.

What is placenta? Give information about hormones produced by the placenta.