In the ovum of rabbit, graafian follicle is
Oogonial cells
Corpus luteum
Corpus albicans
Theca externa, theca interna, oocyte and follicle cells
The gestation period of elephants is about
During embryonic development the establishment of polarity along anterior / posterior, dorsa l/ ventral or medial / lateral axis is called
The type of blastula formed in birds is
$A$ : 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
By the contraction of spermatic cord the testis of man are not taken to the abdominal cavity. It is due to the following structure