When glucose is completely oxidised in aerobic respiration, it produces 38 molecules of ATP.
In cellular respiration, three processes take place one after the other. They are Glycolysis , Krebs cycle and election transfer chain reaction.
In absence of oxygen , Glycolysis can occur only but other further reaction will not take place.
If Glycolysis occurs in the absence of oxygen, it produces alcohol. By anaerobic Glycolysis, only 2 molecules of ATP are produced. This results in less energy supply to the body.
Therefore, Oxygen is necessary for complete oxidation of glucose.
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