Sperm lysins contains

The embryo of man is protected by

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

Cu ions released from copper- releasing Intra Uterine Devices $(IUDs)$

The sperm produces substances of enzymatic nature called sperm lysin. In mammals, it is called

In man sperms move after ejaculation at a rate of nearly