Q. Which one of the following statements is incorrect ?
A) The residual air in lungs slightly decreases the efficiency of respiration in mammals
B) The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
C) In insects, circulating body fluids serve to distribute oxygen to tissues
D) The principle of countercurrent flow facilitates efficient respiration in gills of fishes
Explanation
[Solution from source] Insects carry oxygen directly to tissues through tracheal tubes, and their blood (haemolymph) plays little part in oxygen transport, so this statement is the incorrect one. Residual air does slightly lower efficiency because fresh air is mixed with stale air. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.