The graafian follicle ruptures to release the secondary oocyte (ovum) from the ovary by the process called.....

Meroblastic cleavage refers to one of the following types of division of eggs

Survival time of sperms introduced into the vagina may be

A blastula which is solid, is known as

Give scientific reasons : When male excites sexually epididymis wall shrinks / contracts.

Blastopore is found in