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Carbon dioxide is released during fermentation because it is

  • A.Formed when the alcohol reacts with the water
  • B.A product of the yeast breaking down sugar
  • C.Dissolved into the wort from the surrounding air
  • D.Released from the hops during the boiling stage

Answer: B

Correct answer: A product of the yeast breaking down sugar

The carbon dioxide is generated by the yeast’s own metabolism, one molecule for each of ethanol as glucose is broken down. It is not dissolved from the air and not derived from the hops - on the contrary, the vigorous evolution of gas is what excludes air from an actively fermenting vessel.

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