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JAMB Biology 2008 Question 20

Question 20

Respiration

Exhaled air differs from inhaled air in that it

  1. A.contains less amount of carbon (IV) oxide
  2. B.is usually lower in temperature
  3. C.often has more oxygen
  4. D.usually has more water vapour.
Show the answer and explanation

Answer: D (usually has more water vapour.)

Explanation

Air breathed out has been warmed and moistened in the lungs, so it has more water vapour, more carbon (IV) oxide and less oxygen than inhaled air.