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Which pair of conditions best favours the lactic acid bacteria over their competitors?

  • A.No salt at all with free access to air
  • B.Very high salt with free access to air
  • C.No salt at all with the exclusion of air
  • D.Moderate salt with the exclusion of air

Answer: D

Correct answer: Moderate salt with the exclusion of air

Salt suppresses most competitors while the lactic acid bacteria tolerate it, and excluding air suppresses the aerobic yeasts and moulds while the lactic acid bacteria do not need oxygen. The two conditions together select for the organisms wanted, which is the whole design of the process.

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