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WAEC Biology 2019 Question 27

Question 27

Microorganisms and Health

Tooth decay is usually caused by

  1. A.undigested and absorbed food.
  2. B.eating limited amount of sweetened food.
  3. C.the bacteria in the mouth that metabolize sugar to acids.
  4. D.eating a lot of proteinous foods.
Show the answer and explanation

Answer: C (the bacteria in the mouth that metabolize sugar to acids.)

Explanation

Bacteria in plaque feed on sugar left on the teeth and produce acids. The acids dissolve the enamel and cause decay.