Foetus is nourished by
Placenta
Yolk
Blood
Phagocytosis
Assertion : During fertilization only head of spermatozoa enters egg.
Reason : If several spermatozoa hit the egg at same time, all can enter the egg.
In Human beings, at the end of $12$ weeks (first trimester) of pregnancy, the following is observed
Which one of the following develops from the trophoblast
Which of the following organ is differentiated first during development ?
The persistence of corpus luteum during pregnancy is due to a hormone known as