In ladies, the oviducts are cutted or removed surgically to avoid the chances of fertilization. This is called
Vasectomy
Ovariodectomy
Sterilization
Tubectomy $(Salpingectomy)$
Withdrawal of which of the following hormones is the immediate cause of menstruation?
The seminal plasma along with the sperm is called
The chemical substance found in the surface layer of cytoplasm of spermatozoa is
Repressor theory of activation of fertilization was given by
Human placenta is derived from