What happens during fertilization in humans after many sperms reach close to the ovum?
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida.
All sperms except the one nearest to the ovum lose their tails.
Cells of corona radiata trap all the sperms except one.
Only two sperms nearest the ovum penetrate zona pellucida.
Give scientific reasons : Enzymes are secreted from the cells of trophoblast.
The fertilized egg divides by the process of
Write a note on pregnancy and embryonic development in human beings.
In sexually reproducing animals the union of male and female gamete forms a cell which is called
Describe the process of implantation of embryo.