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WAEC Biology 2002 Question 8

Question 8

Excretion

Which of the following definitions best describes excretion? The

  1. A.liberation of energy from food
  2. B.release of faeces from the body
  3. C.breakdown of food molecules
  4. D.removal of the waste products of metabolism.
Show the answer and explanation

Answer: D (removal of the waste products of metabolism.)

Explanation

Excretion is getting rid of waste made by the body's own chemical reactions (metabolism). Faeces are undigested food, so passing them is egestion, not excretion.