Residual air is the air which remains in the lungs after the most forceful expiration. It is about 1200ml. As the residual air remains in the lungs, it has no effect on respiration efficiency.
Which one of the following statements is incorrect?
Held on 30 Apr 2006 · Verified 9 Jul 2026.
The principle of countercurrent flow facilitates efficient respiration in gills of fishes
The residual air in lungs slightly decreases the efficiency of respiration in mammals
The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
In insects, circulating body fluids serve to distribute oxygen to tissues.
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Frogs respire in water by skin and buccal cavity and on land by skin, buccal cavity and lungs. Choose the correct answer from the following :
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Match List I with List II :  Choose the correct answer from the options given below :
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