Which one of the following animals has a four-chambered heart?
King cobra
Turtle
Chameleon
Crocodile
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This question was previously asked in
UPSC CAPF – 2022
Most reptiles (snakes like King cobra, turtles, lizards like Chameleon) have a three-chambered heart with two atria and a single ventricle, often partially divided. However, crocodiles are unique among living reptiles in possessing a complete four-chambered heart, similar to birds and mammals, which allows for complete separation of oxygenated and deoxygenated blood.