CBSE Class 9 Answered

Hi Surya,

Class reptilia is included in subphylum vertebrata.

Reptiles are terrestrial as well as aquatic.

Some of the features of reptiles are:

• The body is covered with dry water-proof skin with horny epidermal scales or dermal scute plates.
• The body is divisible into head, neck, abdomen and tail.
• The skin is dry, rough and has horny scales on it.
• Cold-blooded, have scales and breathe through lungs right from birth.
• Pentadactyl animals.
• Respire only with lungs.
• Eggs have a tough leathery shell.
• Most of them have a three-chambered heart. Ventricle of the heart is partially divided.
• The eardrum or tympanum lies at the bottom of a tubular depression.