Multiple choice

Which gas is responsible for the leavening of bread (loaf)?

  1. Oxygen

  2. Carbon monoxide

  3. Carbon dioxide

  4. Ammonia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Carbon dioxide (CO2) is produced during fermentation when yeast converts sugars into alcohol and gas. The CO2 bubbles create the airy, risen texture in bread. This process is called leavening and is essential for making bread light and porous.

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