Class Reptilia


 
 
Concept Explanation
 

Class Reptilia

Reptiles are terrestrial vertebrates with a dry, scaly, impermeable skin covered by scales. Their characteristics are :

  • They have limbs which are absent in snakes and some lizards.

  • They respire through lungs.

  • The heart has two auricles and a ventricle which is partly divided.

  • They are cold-blooded (poikilotherms) , i.e., their body temperature varies according to that of the surroundings. (Fish and amphibians too are cold-blooded.)

  • Fertilization is internal. The fertilized eggs are laid with a shell and the young reptile hatches out of the egg.

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    Sample Questions
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    Question : 1

    Identify the feature which is common between birds and crocodiles.

    Right Option : A
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    Question : 2

    Reptiles are the _____________ .

    Right Option : A
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    Explanation
    Question : 3

    What is common among snakes, turtles and lizards?

    1. Presence of scales
    2. Presence of lungs
    3. Presence of tough covering over the egg
    4. Presence of a notochord
    Right Option : D
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