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Per NCERT, how do FISH obtain oxygen for respiration — in their aquatic environment?
AThrough lungs underwater
BThrough GILLS — water enters through the mouth, passes the gills where dissolved O₂ is taken up by blood
CThrough skin only
DThey don't respire underwater
Answer & Solution
Correct answer: B. Through GILLS — water enters through the mouth, passes the gills where dissolved O₂ is taken up by blood
Per NCERT §5.3, fish respire via gills extracting dissolved O₂ from water. Lungs are for terrestrial animals.
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