Partial oxidation and the break down of glucose to Pyruvic acid without the help of oxygen is called

Options

A. Fermentation
B. Anaerobic respiration
C. Glycolysis
D. Combustion

Answer

To solve the question regarding the partial oxidation and breakdown of glucose to pyruvic acid without the help of oxygen, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The question describes a process that involves the breakdown of glucose into pyruvic acid without the presence of oxygen. This indicates that we are dealing with a form of respiration that does not require oxygen.

2. **Identifying Key Terms**: The key terms in the question are "partial oxidation," "breakdown of glucose," "pyruvic acid," and "without the help of oxygen." These terms are crucial in identifying the correct answer.

3. **Analyzing the Options**:
- **Option A: Fermentation**: This is a process that converts sugars into alcohol or acids, typically carried out by microorganisms. While it occurs without oxygen, it is not specifically the breakdown of glucose to pyruvic acid.
- **Option B: Anaerobic Respiration**: This is a broader term that includes various processes that occur without oxygen, but it does not specifically refer to the breakdown of glucose to pyruvic acid.
- **Option C: Glycolysis**: This is the metabolic pathway that involves the partial oxidation of glucose to produce two molecules of pyruvic acid. It occurs in the cytoplasm and does not require oxygen.
- **Option D: Combustion**: This is a chemical reaction that involves burning in the presence of oxygen, making it irrelevant to the question.

4. **Selecting the Correct Answer**: Based on the analysis, the process that specifically describes the breakdown of glucose to pyruvic acid without the need for oxygen is glycolysis. Therefore, the correct answer is **Option C: Glycolysis**.

### Final Answer:
The correct answer is **C: Glycolysis**.