Fermentation is defined as

Options

A. Incomplete oxidation of glucose under condition
B. Complete oxidation of glucose under condition
C. Incomplete oxidation of glucose under condition
D. Complete oxidation of glucose under condition

Answer

### Step-by-Step Solution:

1. **Definition of Fermentation**:
- Fermentation is a metabolic process that involves the conversion of sugars (like glucose) into other compounds, typically in the absence of oxygen (anaerobic conditions).

2. **Chemical Change**:
- During fermentation, a chemical change occurs in organic substances. This process is facilitated by enzymes that help in breaking down the sugars.

3. **Incomplete Oxidation**:
- Fermentation is characterized by the incomplete oxidation of glucose. Unlike aerobic respiration, where glucose is fully oxidized to carbon dioxide and water, fermentation results in the production of by-products like alcohol or acids.

4. **Anaerobic Conditions**:
- Fermentation occurs under anaerobic conditions, meaning that oxygen is not present. This is crucial because the absence of oxygen leads to the incomplete breakdown of glucose.

5. **End Products**:
- The primary end product of fermentation in many organisms (like yeast) is ethanol (alcohol) and carbon dioxide. This is a result of the conversion of glucose without the formation of pyruvate, which is typically seen in aerobic respiration.

6. **Conclusion**:
- Therefore, fermentation can be defined as the metabolic process that involves the incomplete oxidation of glucose under anaerobic conditions, resulting in the production of alcohol or acids.