The extra-embryonic membranes of the mammalian embryo are derived from:

Who demonstrated the acrosome reaction in Saccoglossus?

The fertilized egg divides by the process of

Meroblastic cleavage is

Corpus luteum is a mass of cells found in

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