Question

Oviduct of frog can be called as
A. Bidder’s canal
B. Urinogenital duct
C. Mullerian duct
D. Uterus

Answer 1

Hint: Frogs belong to class Amphibia in Kingdom Animalia. They are oviparous animals, which lays eggs and its process of fertilization is external in nature. The process of fertilization takes place in water and the larvae form which are the tadpoles develop from the fertilized eggs.

Complete answer:
In the class Amphibia, since the process of fertilization is external, the oviducts are primitive and are just simple tubes. These are lined by different glands that produce jelly and mucus, required for the proper development and protection of ova. In male frogs, the oviducts do not have any specific functions, that is, they are vestigial in nature. But in females, the oviducts are larger and possess a lumen at the centre. The role of the oviducts is in the carriage of the ova or the eggs to a structure known as the cloaca, where the eggs are stored before releasing. There is a single opening for reproductive, digestive and urinary tracts. Thus, the oviduct of the frogs is known as the Mullerian duct.
i. Bidder’s Canal is found in male frogs. It is found inside the kidneys. The function of these structures is to receive sperms or male gametes from testes through another duct known as vasa efferentia. In other words, the function of this canal is in the carriage of sperms.
ii. Urogenital tract is the combined route for the transport of both gametes and urine. It is found mainly in male animals. The vas deferens carrying the sperms constitute the genito portion, and the ureters carrying the urine makes up the urino portion. The two ducts merge into the urethra from where it gets into the opening.
iii. Uterus is the secondary sexual organ present in animals. It is a muscular organ that is involved in the development of the fetus. It is present in viviparous animals, which give birth to offspring.
Hence, the correct answer is option C.

Note: Like digestive, reproductive and urinary systems, frogs possess a unique respiratory system too. These animals have three methods of respiration. It respires through the moist skin surface in water. Terrestrially, it respires through lungs and through the mouth cavity.