Question

What is Bidder 's Canal?How is it important in frogs?Label the Bidders canal in the reproductive system of a frog.

Answer 1

Each testis of frog is located anterioventrally towards the inner margin of kidney. It is covered by a thin layer of peritoneum called mesorchium. Each testis is small oblong or cylindrical, slightly reddish yellow in color. The vasa efferentia arise from each testis and enter the kidney to open in the Bidder's Canal. They are thin and slender. There are about 10 to 12 vasa efferentia in number. The Bidder's canal runs longitudinally along the inner margin of the kidney and communicates with the urinogenital duct by several transversely arranged collecting tubules.

Answer 2

Bidder's canal is present inside kidney of frog. It receives sperms from testes via a number of vasa efferentia.

Explanation:

Testes lies very close to kidney in frog. From each testes 10 to 12 vasa efferentia arise to enter kidney of same side. These will open in Bidder's canal: a duct carrying sperms and running longitudinally through kidney.

In frogs, urine produced by nephrons will flow into the ureter from longitudinal collecting duct. Bidder's canal remains connected to this by several transverse collecting tubules.

Ureter of frog is an urinogenital duct as it is the outlet for both urine and sperms from kidney.