Fertilization is the fusion of which of the following?

$Statement I$: Penetration of sperm into ovum is a chemical process. $Statement II$: Acrosome of sperm secretes hyaluronidase which dissolves the corona radiata of the ovum.

The chromosome set in a zygote is:

Implantation or uterine attachment of the blastocyst presumably occurs between

When the cleavage furrow extends from the animal pole to the vegetal pole and does not bisect the egg equally into two blastomeres,the plane of cleavage is:

Which part of the sperm enters the ovum during fertilization in humans?