Q161 / 200 · NEET 2006 · Zoology

Which one of the following statements is incorrect?

A
The principle of countercurrent flow facilitates efficient respiration in gills of fishes
Correct answer
B
The residual air in lungs slightly decreases the efficiency of respiration in mammals
C
The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
D
In insects, circulating body fluids serve to distribute oxygen to tissues.

Solution

Residual air is the air which remains in the lungs after the most forceful expiration. It is about $1200 \mathrm{ml}$. As the residual air remains in the lungs, it has no effect on respiration efficiency.

Hence, the correct answer is option: 'B'.

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