Question

Which type of kidney is found in amphibian frog
(a) Holonephric
(b) Mesonephric
(c) Pronephric
(d) Metanephric

Answer 1

Hint: Excretory organs of aquatic vertebrates which are temporary excretory organs in reptiles, aves, and mammals. Wolffian ducts of vertebrates contain these ducts.

Complete answer:
In aquatic vertebrates mesonephros act as the excretory organs which is a temporary excretory organ in reptiles,aves, and mammals. Wolffian ducts are a pair of ducts present in the excretory organs. Mesonephros are included in those ducts. Mesonephric and paramesonephric blastoma together form the Wolffian duct. Amphibians like a frog are adapted to live on both land and water so their kidneys are like aquatic vertebrates i.e, mesonephric kidneys.

Additional Information: The first vertebrates to come out of the water and walk on land are amphibians.
- They are tetrapods that have the ability to live in the aquatic habitat of their ancestors, the fishes, and in the terrestrial habitat that they first invaded.
- They are first tetrapods and lead a dual-mode of life i.e, on land and freshwater.
- The body is divided into head and trunk. The tail may or may not be present.
- Skin is soft, scale-less, moist, and glandular.
- The body bears two equal or unequal pentadactyl limbs.
- Skulls are dicondylic as in mammals. Vertebrae are mostly proceolus in anurans, amphicoelous in the caecilians, and usually opisthocoelous in the urodeles.
- Excretion is via kidneys and kidneys are mesonephric and adult amphibians are ureotelic.

So, the correct answer is “Mesonephric”.

Note:
 -Generally in amphibians skin is soft, scaleless except in members of the Apoda.
-Frogs and toads are the tailless amphibians that belong to the order Anura or salients.
-Rana tigrina is the most common Indian frog which is popularly known as the Indian bullfrog.