Which type of placenta is present in the early human embryo?
Discoidal
Diffuse
Zonary
Cotyledonary
$A$ : All copulations do not lead to fertilisation and pregnancy.
$R$ : Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction
The longest gestation period is found in
Germinal epithelium gives rise to
Tertiary egg membranes are lacking in mammals with the exception of the
Which of the following enzyme helps sperm to penetrate zona pellucida?