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Per NCERT Class 10 Biology Ch 5, how many CHAMBERS does the human heart have?
AThree chambers
BFour chambers — 2 atria (upper) + 2 ventricles (lower)
CTwo chambers only
DSix chambers
Answer & Solution
Correct answer: B. Four chambers — 2 atria (upper) + 2 ventricles (lower)
Per NCERT §5.4.1 Fig 5.10, human heart has 4 chambers (2 atria + 2 ventricles). Fish has 2; amphibians/most reptiles have 3.
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