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WAEC Biology 2006 Question 27

Question 27

Respiration

If the mucus in the air track of mammals dry up and the hairs in the nostrils are removed

  1. A.impure air would be breathed into their lungs
  2. B.the speed of air movement into their lungs would increase
  3. C.breathing air into their lungs would be difficult
  4. D.more air would be taken into their lungs
Show the answer and explanation

Answer: A (impure air would be breathed into their lungs)

Explanation

Nostril hairs and mucus trap dust and germs; without them dirty air would reach the lungs.