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JAMB Biology 2008 Question 39

Question 39

Pollution

The easiest way to establish the level of pollution in a local stream is to measure the level of

  1. A.oxygen
  2. B.carbon (IV) oxide
  3. C.ammonia
  4. D.alkalinity.
Show the answer and explanation

Answer: A (oxygen)

Explanation

Sewage and organic waste feed decomposers, which use up the dissolved oxygen. The lower the oxygen level, the more polluted the stream.