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Which of the following use diffusion as the principal method of gaseous exchange?

A. grasshopper

B. rat

C. lizard

D. earthworm

QUICK ANSWER…

D

DETAILS…  

Earthworms employ diffusion to exchange gasses with the environment, they do not have lungs, neither do they breath through their mouth. read more

Now for the right answer to the above question:

1. Option A is incorrect; grasshoppers and other insects breath through the tracheae.
2. Option B is incorrect; rats have lungs, they do not breath through diffusion.
3. C is also incorrect; lizards have lungs, and well-developed breathing system.
4. D is the correct answer; earthworms perform gaseous exchange mainly by diffusion.

KEY-POINTS…

You may please note that:

• The taking in of air through the spiracles in insects does not necessarily mean diffusion. The spiracles are just physical openings through which air makes its way to the tracheae.
• Earthworms do not have lungs, neither do they breath through their mouth, they take in oxygen directly from their moist environment.

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/ culled from 2015 JAMB-UTME biology past question 3 /