Of the following, which one is better respiratory medium___________?
Correct answer: A. Air
- A. Air
- B. Water
- C. Soil
- D. None of these
Explanation
Air is a better respiratory medium than water because it contains a much higher concentration of oxygen and gases diffuse more rapidly through it. Students may choose water because aquatic animals also respire successfully, but water is a poorer medium and must be passed over respiratory surfaces continuously.
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