Sugars are the ultimate source for yeast. It converts the sugar into pyruvate by the process of glycolysis. Under anaerobic condition, the pyruvate is reduced to acetaldehyde and finally to ethanol and carbon dioxide as waste products. It is an extracellular process which produces two ATP.
So, the correct answer is option D.
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In anaerobic respiration, yeasts can produce alcohol from pyruvate. Imagine a situation in which we control oxygen intake and initiate anaerobic respiration in our body, can we produce alcohol in our body?
Question 2 Yeast is used in wine and beer industries because it respires