Based on the number of chambers in the heart, select the odd one from the following.
Show answer & explanation
Correct answer: D
Explanation
The Correct Answer is option 4 i.e. Crocodile .
Crocodile is the odd one out because it has a four-chambered heart, which is more advanced and efficient for separating oxygenated and deoxygenated blood—similar to birds and mammals. This adaptation supports their active predatory lifestyle and partial warm-bloodedness. The other animals listed—turtle, frog, and chameleon—have a three-chambered heart, which mixes oxygenated and deoxygenated blood to some extent. Thus, based on heart chamber number, crocodile stands apart.
Other Options:
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Turtle: Has a three-chambered heart; two atria and one ventricle.
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Frog: Also has a three-chambered heart, typical of amphibians.
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Chameleon: Reptile with a three-chambered heart like most reptiles.