Pick the hormone which is not secreted by the human placenta.

Assertion: In the morula stage,cells divide without an increase in size.
Reason: Zona pellucida remains undivided until cleavage is complete.

Which of the following statements is correct regarding the morula in humans?

$A$: 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.

What is the cavity of the gastrula called?

The gonads are derived from which embryonic layer during embryonic development?