2018 · Q49
Which of the following classes of animals has/ have three-chambered heart?
General KnowledgeBiology
- APisces and Amphibia
- BAmphibia and Reptilia
- CReptilia only
- DAmphibia only
Explanation
Amphibians have three-chambered hearts (two atria, one ventricle), and so do most reptiles (crocodilians excepted). Fish have two-chambered hearts, while birds and mammals have four. Hence the classes with three-chambered hearts are Amphibia and Reptilia.