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JAMB Chemistry 1986 Question 27

Question 27

Environmental Pollution

Oxygen-demanding wastes are considered to be a water pollutant because they

  1. A.deplete oxygen which is necessary for the survival of aquatic organisms
  2. B.increase oxygen which is necessary for the survival of aquatic organisms
  3. C.increase other gaseous substances which are necessary for the survival of aquatic organisms
  4. D.deplete other gaseous species which are necessary for the survival of aquatic organisms.
Show the answer and explanation

Answer: A (deplete oxygen which is necessary for the survival of aquatic organisms)

Explanation

Bacteria breaking down these wastes use up the dissolved oxygen in the water, so fish and other aquatic life suffocate.