Multiple choice

Which of the following organs help earthworm in respiration?

  1. Lungs

  2. Gills

  3. Trachea

  4. Spiracles

  5. Skin
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Earthworms respire through their moist skin, a process called cutaneous respiration. They have no specialized respiratory organs like lungs, gills, or trachea. Oxygen diffuses directly through their skin into their bloodstream, and carbon dioxide diffuses out. This requires their skin to remain moist for gas exchange to occur.

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