The two chambered heart is observed in

fishes

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lizards

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frogs

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crocodile

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Solution

The correct option is A fishes
All vertebrates possess a muscular chambered heart.
Fishes have a 2-chambered heart with an atrium and a ventricle. Amphibians (frogs) and the reptiles (lizards) have a 3-chambered heart with two atria and a single ventricle.
Crocodiles (exception of reptiles), birds and mammals possess a 4-chambered heart with two atria and two ventricles.

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Similar questions

Q. In the developmental history of mammalian heart, it is observed that is passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage.
To which hypothesis can this above cited statement be approximated?

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In the developmental history of mammalian heart, it is observed that it passes through a two-chambered fish like heart, three-chambered frog-like heart and finally four-chambered stage. To which hypothesis can this above cited statement be approximated?

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Standard XII Biology

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