Question

The end product of fermentation are

• A. CO₂ and acetaldehyde
• B. O₂ and C₂H₅OH
• C. CO₂ and C₂H₅OH
• D. CO₂ and O₂

Answer 1

The correct option is C

CO₂ and C₂H₅OH

The correct option is C.

Explanation of the correct option.

1. It is anaerobic respiration that occurs in the absence of oxygen.
2. This process mainly takes place in the yeast and bacteria, and also in the oxygen-stopped muscle cells.
3. In alcoholic fermentation pyruvic acid which is the end product of glycolysis is first converted into acetaldehyde.
4. The conversion of pyruvic acid into acetaldehyde takes place in the presence of pyruvate decarboxylase.
5. In this chemical reaction, CO₂ is released.
6. This acetaldehyde is again reduced into alcohol in the presence of the enzyme alcohol dehydrogenase.
7. This concludes that at the end of alcoholic fermentation we get carbon dioxide and ethanol as the end product.

Explanation of the incorrect options:

Option A:

1. CO₂ is released but acetaldehyde is further reduced.

Option B:

1. Oxygen is not released in this process.

Option D:

1. Oxygen is not released in this process.
   

Final answer: The end product of fermentation is CO₂ and C₂H₅OH.