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Which is true of the carbon dioxide produced during vegetable fermentation?

  • A.It is produced only by moulds growing at the surface
  • B.It must be prevented entirely for the process to work
  • C.It is a normal product that helps exclude oxygen
  • D.It indicates that the fermentation has been contaminated

Answer: C

Gas from the heterofermentative stage is expected and useful, since it blankets the surface and keeps air away. In cucumbers the same gas causes bloating if it cannot escape, which is a problem of control rather than of contamination.

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