In germinating seeds fatty acids are degraded exclusively in the

Options

A. Mitochondria
B. Proplastids
C. Glyoxysomes
D. Peroxisomes

Answer

To answer the question "In germinating seeds, fatty acids are degraded exclusively in the:", we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution

1. **Understanding the Context**:
- Germinating seeds utilize stored nutrients to support growth. One of the stored nutrients is fat, which is composed of fatty acids.

2. **Identifying the Organelles**:
- The options given are mitochondria, proplastids, glyoxysomes, and peroxisomes. We need to understand the role of each organelle in fatty acid degradation.

3. **Role of Glyoxysomes**:
- Glyoxysomes are specialized organelles found in plant cells, especially in fat-rich seeds. They are responsible for the breakdown of fatty acids through a process called beta-oxidation.
- In addition to beta-oxidation, glyoxysomes also facilitate the glyoxylate cycle, which converts fatty acids into carbohydrates (sugars) that the plant can use for energy during germination.

4. **Role of Mitochondria**:
- Mitochondria are known as the powerhouse of the cell and are primarily involved in ATP production. While they can participate in the breakdown of fatty acids, they do not exclusively handle the degradation of fatty acids in germinating seeds.

5. **Role of Proplastids**:
- Proplastids are immature plastids that can develop into chloroplasts or other types of plastids. They are not involved in the degradation of fatty acids.

6. **Role of Peroxisomes**:
- Peroxisomes are involved in various metabolic processes, including the breakdown of fatty acids. However, they are not exclusive to plants and do not specifically handle the degradation of fatty acids in germinating seeds.

7. **Conclusion**:
- Based on the functions of these organelles, the correct answer is **glyoxysomes**. They are specifically adapted for the degradation of fatty acids in germinating seeds.

### Final Answer:
In germinating seeds, fatty acids are degraded exclusively in the **glyoxysomes**.