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Per NCERT, why is the rate of BREATHING in aquatic organisms FASTER than in terrestrial animals?
ABecause dissolved O₂ in water is much LESS than O₂ in air — so fish must pass more water across gills
BWater is heavier so harder to breathe
CFish are larger animals
DFish are slower
Answer & Solution
Correct answer: A. Because dissolved O₂ in water is much LESS than O₂ in air — so fish must pass more water across gills
Per NCERT §5.3, low dissolved O₂ in water → fish need faster gill ventilation than terrestrial breathing.
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