Question

Which substance is produced in anaerobic respiration by an organism but not in aerobic respiration?

• A. Carbon dioxide
• B. Water
• C. Ethanol
• D. Acetic acid

Answer 1

The correct option is C Ethanol

• Fermentation is a form of anaerobic respiration in which alcohol is formed by the breakdown of glucose in the absence of oxygen.
• In alcoholic fermentation, pyruvic acid is converted into ethanol with the liberation of carbon dioxide. The alcoholic fermentation equation is as follows:

C${}_6$H${}_{12}$O${}_6$ + 2 ADP + P $\to$ 2 C${}_2$H${}_5$OH + 2 CO${}_2$ + 2 ATP

Therefore, the correct answer is option C.