Question

Which is not a true amphibian animal?
A. Salamander
B. Toad
C. Tortoise
D. Frog

Answer 1

Hint: Animals of class amphibia can live in water as well as on land. It includes toads, salamanders, frogs, newts etc. Amphibians are cold-blooded animals. They cannot regulate their body temperature according to the environment.

Complete answer: A tortoise is not a true amphibian animal; it is a reptile. A tortoise can live on land as well as in water but its body is covered by the shell (provides protection), dorsally by carapace and ventrally by plastron. The presence of protective shells is not a characteristic feature of true amphibians. Amphibians are vertebrates that live on both land and water. They respire through gills and moist body surface but on land, they respire through lungs. Frogs, toads and salamanders are examples of amphibians. But they all are different from each other. Salamander and frog both are vertebrate amphibians but salamander looks like a lizard and frog does not look like a lizard. Actually, both of them are amphibians because they possess more similarity than dissimilarity. The skin of the frog is moist, while that of a toad is much drier and waterproof. These toads are generally found in woods, gardens.
Hence, the correct option is C.

Note: Frog shows metamorphosis. Metamorphosis is a biological developmental process which involves the development of an adult organism from the larva. Cell growth and cell differentiation occur in larva which leads to the growth and becomes an adult. Larvae lack lungs, so they respire completely through gills and adults through lungs.