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WAEC Biology 2007 Question 9

Question 9

Microorganisms and Health

Yeast is added to the dough during the preparation of bread because it produces

  1. A.ethanol
  2. B.heat
  3. C.carbon dioxide
  4. D.carbohydrate
Show the answer and explanation

Answer: C (carbon dioxide)

Explanation

Yeast ferments the sugar in the dough and gives off carbon dioxide gas, which makes the dough rise.