Answer:
(a)
In the Presence of Oxygen When breakdown of glucose is carried out in the
presence of oxygen in a cell, it is called as aerobic respiration.
Glucose is converted to three-carbon molecule called pyruvate. Pyruvate
further breaks down in presence of oxygen to form carbon dioxide, water and
release energy.
+ Water + Energy
(b) In the Absence of Oxygen When breakdown of glucose is
carried out in the absence of oxygen in a cell, it is called anaerobic
respiration.
This process is called as fermentation in microbes. Ethyl
alcohol is produced by breakdown of pyruvate.
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