A) ethyl alcohol
B) curd
C) citric acid
D) acetic acid
Correct Answer: A
Solution :
Alcohol fermentation is carried out by a number of bacteria and yeast (Saccharomyces). The ethanol and carbon dioxide produced by Saccharomyces are useless for yeast but useful to humans. Acetic acid is synthesised by the help of Acetobacter (bacterium) Citric acid is produced by the help of fungus Aspergillus.
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