When more than one sperm establish contact and penetrate into the egg, then it is called

If both ovaries are removed from a rat, then which hormone is decreased in blood

The development of eye in vertebrate embryology is studied under

Which of the following is not a correct statement about umbilical cord?

$A$ : After menopause the levels of blood gonadotropins will rise markedly.
$R$ : At the time of menopause all the ovarian follicles are converted into follicular atresia and the ovaries are not responding to the gonadotropins