Multiple choice

If fermentation is allowed to proceed in a closed vessel,

  1. vacuum will result

  2. no change will occur

  3. gas pressure will develop because of excess of CO2

  4. gas pressure will develop because of excess of oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During fermentation, yeast converts sugars into ethanol and carbon dioxide gas. In a closed vessel, the CO2 accumulates and creates pressure since it cannot escape. The pressure is from excess CO2, not oxygen (which would actually be consumed in aerobic respiration).

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