Question

Give brief answer why oxygen is necessary for complete oxidation of glucose

Answer 1

Oxygen is necessary for complete oxidation of glucose because when we respire the glucose in converted into ATP at two places first in cytoplasm and second in mitochondria. In cytoplasm glucose is converted into ATP in the absence of oxygen and hence only 2 ATP molecules are produced with some some alcohol and lactic acid but when glucose is oxidised into mitochondria in the presence of oxygen 38 molecules of ATP is produced and complete oxidation occurs.

Answer 2

Answer:

• All living organism requires energy to live and to perform any useful functions.  
• This energy they get from food they eat. Energy is released when food contains nutrients, let’s say carbohydrate (glucose).  
• Energy released in the cells when oxidation of glucose occurs which means the carbohydrates which we eat converted into simpler substances with the help of oxygen.  
• For complete oxidation of glucose (i.e the breakdown into simpler substances) oxygen is necessary.