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WAEC Biology 2016 Question 29

Question 29

Pollution

The diagram below shows the effect of nitrates on water bodies. Another cause that could lead to the phenomenon in the diagram is

Diagram for this question
  1. A.exhaust from cars.
  2. B.oil spillage.
  3. C.dumping of sewage.
  4. D.excess rainfall.
Show the answer and explanation

Answer: C (dumping of sewage.)

Explanation

Sewage is rich in nitrates and phosphates, so dumping it into water also feeds algae and causes eutrophication.