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WAEC Biology 2009 Question 2

Question 2

Microorganisms and Health

Viruses are economically important because they

  1. A.do not have cell structures.
  2. B.can only reproduce inside living cells.
  3. C.cause diseases in plants and animals.
  4. D.exist as crystals outside living cells.
Show the answer and explanation

Answer: C (cause diseases in plants and animals.)

Explanation

Economic importance is about effect on people: viruses cause diseases of crops, livestock and humans. The other options are just features of viruses.