$A$ : In frog gray cresent is formed during fertilization.
$R$ : It is because the black granules move towards the point of entry of the sperm in animal half
Assertion and Reason both are correct and also correct explantion.
Assertion and Reason both are correct but not explanation of assertion.
Assertion is correct, but Reason is incorrect.
Both Assertion and Reason are incorrect.
Type of placenta in the human is
The estrous cycle occurs in
In human females ova are produced in
The fertilization membrane during fertilization is synthesized by
In the embryonic development of chordate the animal pole forms one of the following of the adult