which metabolic pathway is taking place in resulting the formation of Co2 in preparation f idlies?

Fermentation is the process by which the batter for idli is prepared. The microorganisms perform aerobic or anaerobic respiration that results in formation of CO₂. The raising up appearance of the batter is due to the formation of carbon dioxide. By the process of respiration, microorganism breakdown glucose and as a result car bon dioxide is emitted. In case of anaerobic respiration also carbon dioxide and ethanol is released by pyruvic acid which is produced from incomplete oxidation of glucose.