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WAEC Biology 2007 Question 43

Question 43

Pollution

The effect of chlorofluorocarbon is

  1. A.reduction of oxygen concentration in the atmosphere
  2. B.depletion of the ozone layer
  3. C.screening of ultra violet rays
  4. D.increase in carbon dioxide concentration
Show the answer and explanation

Answer: B (depletion of the ozone layer)

Explanation

CFCs from old fridges and aerosol sprays break down ozone in the upper atmosphere, thinning the ozone layer.