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WAEC Biology 1991 (August) Question 4

Question 4

Respiration

The mechanism of gaseous exchange in living organisms is essentially by

  1. A.osmosis
  2. B.inhalation
  3. C.diffusion
  4. D.exhalation
  5. E.breathing
Show the answer and explanation

Answer: C (diffusion)

Explanation

Oxygen and carbon dioxide pass across respiratory surfaces by diffusion, from high to low concentration.