which is right???


Ans. Option 2) is correct: Evolution of CO2
Carbon dioxide is evolved in both aerobic respiration and alcoholic fermentation. 

Aerobic respiration is a process that breaks down food with the help of O2 to release energy. The chemical reaction is as follows:
C6H12O6  + 6 O2  → 6 CO2 + 6 H2O  + Energy (ATP)

Alcoholic fermentation is the process which takes in absence of oxygen in living cells. In this process glucose is broken down into ethyl alcohol and carbon dioxide. This process is the basis for production of bread, wine, beer etc.


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