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Question

Animals breathe in air rich in ________ and breathe out air rich in__________.


  1. oxygen, carbon dioxide

  2. carbon dioxide, oxygen

  3. oxygen, nitrogen

  4. nitrogen, carbon dioxide


Solution

The correct option is A

oxygen, carbon dioxide


Animals breathe in air rich in oxygen and breathe out air rich in carbon dioxide. The air that we inhale contains 78% nitrogen, 21% oxygen and small amounts of carbon dioxide, argon, neon, helium and hydrogen. The air that we exhale contains 4% to 5% by volume of carbon dioxide, about a 100 fold increase over the inhaled amount. The volume of oxygen is reduced by a small amount, 4% to 5%, compared to the oxygen inhaled.

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