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JAMB Biology 1981 Question 25

Question 25

Respiration

In a bakery, yeast is added to flour to make bread rise. This is possible because yeast produces

  1. A.alcohol
  2. B.oxygen
  3. C.carbon dioxide
  4. D.energy
  5. E.ethanol.
Show the answer and explanation

Answer: C (carbon dioxide)

Explanation

Yeast ferments sugar and gives off carbon dioxide gas, whose bubbles make the dough rise.