An example of destructive metabolism (catabolism) is

Options

A. Photosynthesis
B. Respiration
C. Glycogenesis
D. Both B and C

Answer

### Step-by-Step Solution:

1. **Understanding Metabolism**: Metabolism consists of two main processes: anabolism and catabolism. Anabolism refers to the building up of complex molecules from simpler ones, requiring energy, while catabolism refers to the breakdown of complex molecules into simpler ones, releasing energy.

2. **Identifying Catabolism**: Catabolism is often referred to as destructive metabolism because it involves breaking down substances. This process releases energy that can be used by the organism for various functions.

3. **Analyzing the Options**:
- **Photosynthesis**: This process is anabolic as it builds glucose from carbon dioxide and water using sunlight. It requires energy.
- **Respiration**: This process is catabolic as it involves the breakdown of glucose (a complex organic compound) to release energy.
- **Glycogenesis**: This is the process of converting glucose into glycogen for storage, which is also anabolic.
- **Both B and C**: This option suggests that both respiration and glycogenesis are examples of catabolism, which is incorrect since glycogenesis is anabolic.

4. **Conclusion**: Among the given options, respiration is the only example of destructive metabolism (catabolism) as it involves the breakdown of complex organic compounds to release energy.

### Final Answer:
The correct answer is **Respiration**.

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