Q.

The characteristics of class Reptilia are

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body covered with moist skin which is devoid of scales, the ear is represented by a tympanum, alimentary canal, urinary and reproductive tracts open into a common cloaca

fresh water animals with bony endoskeleton, air-bladder to regulate buoyancy

marine animals with cartilaginous endoskeleton, body covered with placoid scales

body covered with dry and cornified skin, scales over the body are epidermal, they do not have external ears.

answer is 4.

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Detailed Solution

In reptiles, body covered with dry and cornified skin, scales over the body are epidermal and they do not have external ears.Skin is moist and scaleless in amphibians.Members of Osteichthyes have air bladder for buoyancy.Members of Chondrichthyes have bony endoskeleton and placoid scales.

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