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  4. In which one of the following processes CO2 is not released?

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Q. In which one of the following processes $CO_2$ is not released?

AIPMTAIPMT 2014Respiration in Plants

Solution:

Anaerobic respiration or fermentation can be of two types, i.e., lactate fermentation and ethanol fermentation. Lactate fermentation produces lactic acid only as pyruvic acid produced in glycolysis is directly reduced by NADH to form lactic acid and no $CO_2$, is produced. Alcoholic (ethanol) fermentation involves conversion of pyruvate to acetaldehyde, hence, $CO_2$, is released.