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Per NCERT, why do mammals + birds have FOUR-chambered hearts (vs. 3 in amphibians)?
ATo pump faster
BTo completely SEPARATE oxygenated and deoxygenated blood — supporting high-energy needs for body-temperature maintenance
CNo reason
DTo produce more heart sounds
Answer & Solution
Correct answer: B. To completely SEPARATE oxygenated and deoxygenated blood — supporting high-energy needs for body-temperature maintenance
Per NCERT §5.4.1, 4-chamber separation enables efficient O₂ supply for warm-blooded high-energy mammals + birds. 3-chamber amphibians tolerate some mixing.
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