Class 11 Biology Respiration In Plants Fermentation


  • Fermentation is the incomplete oxidation of glucose under anaerobic conditions by sets of reactions.
  • Fermentation is of two types
  • Alcohol fermentation
  • Lactic acid fermentation.
  • In alcohol fermentation, pyruvic acid is converted to CO2 and ethanol by pyruvic acid decarboxylase and alcohol dehydrogenase.

Glucose -> 2 Ethyl alcohol + 2NADH2 + 2ATP

  • In lactic acid fermentation, lactic acid is produced from pyruvic acid by lactate dehydrogenase.

Glucose -> 2 Lactic acid + 2 ATP.

  • In eukaryotes, these steps take place within the mitochondria and this requires O2.



Fig. Lactic acid dehydrogenase

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