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WAEC Biology 2003 Question 10

Question 10

Excretion

Which of the following substances is a common excretory product in both plants and animals?

  1. A.Urine
  2. B.Oxygen
  3. C.Mineral salts
  4. D.Carbon dioxide
Show the answer and explanation

Answer: D (Carbon dioxide)

Explanation

Both plants and animals respire and give off carbon dioxide as waste. Oxygen is a waste only of photosynthesis in plants, and urine only of animals.