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Solution


Q.

In which one of the following processes CO2 is not released           [2014]
1 Aerobic respiration in plants  
2 Aerobic respiration in animals  
3 Alcoholic fermentation  
4 Lactate fermentation  

Ans.

(4)

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 CO2 is produced. Alcoholic (ethanol) fermentation involves conversion of pyruvate to acetaldehyde, hence, CO2 is released.