Question

What is Bidder’s Canal and what is its function?

Answer 1

The frog shows varied sexual dimorphism. Bidders Canal is found in the Frog. It is part of the male reproductive system and is absent in females. The bidder’s canal connects the urinary parts and the genitals of the male frog.

Complete answer:
To answer this question, we must know about the male reproductive parts of the frog.
The male reproductive system of the frog consists of the following organs-
-Testes (one pair): they are yellow in colour and oval-shaped which are attached to the dorsal wall of the kidney. Each testis has Seminiferous tubules consisting of the germinal cell which produces spermatozoa also known as Sperm.
-Vasa efferentia -a group of 10 to 12 that opens into bidders' canals and arises from testes.
-Bidders canal is connected to the longitudinal collecting tubules through a number of transverse collecting ducts and therefore helps in the passing of the sperms. It communicates with the ureter, which leaves the kidney near its kind end and opens into the cloaca.
-Seminal vesicle: Urinogenital duct expands to form seminal vesicles in which sperms are stored and for their nourishment they also contain fructose.
-Cloaca: Urinogenital duct open into the cloaca which is used to pass faecal matter, urine and sperms.

Thus, the Bidder canal is present in the kidney of a male frog and is the part of his reproductive system which receives sperms from the vasa efferentia and helps in the passing of the sperm.

Note: Bidder’s canal does not store sperm or spermatozoa in it, it is meant only for the passage through which sperms enter to it through vasa efferentia and enters into the cloaca. The testis of the frog is present in close proximity to the testis.