Question

Fermentation by yeast produces

I. Carbon dioxide
II. Oxygen
III. Water
IV. Alcohol

• A. I only
• B. I and II
• C. I, II and III
• D. I, III and IV
• E. I and IV

Answer 1

The correct option is D I, III and IV

Fermentation is a metabolic process occurs in yeast and bacteria. It occurs in the absence of oxygen. The products produced by yeast includes carbon dioxide, water and ethanol. Glycolysis is the first step of fermentation pathways as well which produces pyruvate, however other steps Kreb's cycle etc. does not take place in the absence of oxygen. Hence option D is correct.

This process is extensively used in alcohol industry.