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  4. At what percent of alcohol concentration does the yeast poison itself to death?

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Q. At what percent of alcohol concentration does the yeast poison itself to death?

NTA AbhyasNTA Abhyas 2020Respiration in Plants

Solution:

Yeast undergoes alcoholic fermentation to releases less energy due to anaerobic respiration. It produces ethyl alcohol as a by-product and releases carbon dioxide. At 13% concentration of alcohol yeast starts poisoning itself. This situation does not occur in aerobic respiration because of oxidation reaction.