Why amphibians and many reptiles have three chambered heart?

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Solution

As we move from the lower classes of vertebrates to the higher classes, we observe that the heart's structure becomes more functional with an increase in the number of chambers.
Fishes have two-chambered hearts.
Amphibians and most reptiles (except crocodiles) have three-chambered hearts.
Birds and mammals have four-chambered hearts.
Amphibians and reptiles (except for crocodiles) contain a three-chambered heart with only one ventricle. This is because these animals have a slower metabolism rate and hence, they require a lower amount of oxygen per liter of blood to be delivered to the body.

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Question 15
Amphibians do not have the following

(a) Three chambered heart
(b) Gills or lungs
(c) Scales
(d) Mucus glands

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