Ncert Exercises & Solutions

Which one of the following sets of animals share a four chambered heart?

1. Amphibian, Reptiles, Birds

2. Crocodiles, Birds, Mammals

3. Crocodiles, Lizards, Turtles

4. Lizards, Mammals, Birds

(b) Crocodiles, birds, mammals have four-chambered heart.

Heart is usually three chambered in reptiles with an exception crocodiles, which possess four chambered heart. The division in their heart is due to the incomplete interventricular septum, in ventricles.

Heart in birds and mammals is four chambered and there is a complete division of interventricular septum in ventricles. Whereas, amphibians possess a three chambered heart in which the ventricle are not divided hence, 2 atria and one ventricle is present.

Page 58-60, XI NCERT

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