First slide

Classification of Animals

Question

Consider the following features.
A. Tympanum.
B. Two pairs of limbs
C. Moist skin.
Select the correct set of animals which possess all the above characteristics.

Moderate

A

Rana, Testudo, Ichthyophis
B

Bufo, Hyla, Salamandra
C

Calotes, Alligator, Rana
D

Trygon, Bufo, Testudo

Solution

The given characteristic are of the class Amphibia.
Tympanum is present in both amphibians (e.g., Ichthyophis, Salamandra, Rana, Bufo, Hyla) and reptiles (e.g., Testudo, Chelone, Calotes, Alligator).
The skin of reptiles is dry and cornified, whereas amphibian skin is moist.
Both amphibians and reptiles have two pairs of pentadactylous limbs (except for apodans and snakes). Ichthyophis is a limbless amphibian.

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