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Solution
The correct option is Da−pyruvicacid,b−CO2+H2O,c−lacticacid,d−ethylalcohol+CO2
Glucose is converted into (a) pyruvic acid by the process of glycolysis.
The fate of pyruvic acid depends upon the availability of oxygen.
Some organisms adapt the Krebs cycle (in presence of oxygen) for complete oxidation of glucose to (b) CO2 and H2O.
Some organisms adapt anaerobic ways to oxidize glucose, but it's less efficient as incomplete oxidation of glucose takes place in it. It is known as Fermentation.
Fermentation by bacteria gives (c) lactic acid, whereas, by yeast, gives (d) ethyl alcohol and CO2 as the end products. Hence, correct option is D.