The abdominal passage which connects the abdominal cavity with the scrotal sac in mammals is known as
Spermatic canal
Neurenteric canal
Inguinal canal
Haversion canal
In the first phase of gastrulation of amphibians there occurs the separation of
$A$ : The morula passes through the phase of compaction, produces two major type of cells : the peripheral cells and the inner cell mass.
$R$ : The descendants of inner cell mass become the trophoblast cells
In the diagram of section of Graafian follicle, different parts are indicated by alphabets; choose the answer in which these alphabets have been correctly matched with the parts they indicate........
Meiosis can be observed in
Which of the following develops from ectoderm