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WAEC Biology 2015 Question 36

Question 36

Microorganisms and Health

Oil applied to the surface of water kills the larvae of mosquitoes through

  1. A.dehydration.
  2. B.poisoning.
  3. C.starvation.
  4. D.suffocation.
Show the answer and explanation

Answer: D (suffocation.)

Explanation

Mosquito larvae breathe air through a siphon at the water surface. An oil film blocks the siphon, so the larvae suffocate.