In a human foetus,the limbs and digits develop after:

$A$: If both the ovaries are removed after the first trimester of pregnancy,still there would be normal growth of the foetus.
$R$: After the first trimester,the placenta secretes sufficient progesterone.

If both ovaries are removed from a pregnant human female in the first trimester of pregnancy,then it will lead to:

Where is the chorion found?

In which stage is the archenteron cavity observed?

Assertion : After ovulation,the Graafian follicle transforms into corpus luteum.
Reason : The corpus luteum secretes a large amount of progesterone.