The rate of decomposition is controlled by

Options

A. Chemical composition of detritus
B. Climatic factor
C. both a)and b)
D. natural of detrivores

Answer

### Step-by-Step Solution:

1. **Understanding Decomposition**:
- Decomposition is the process by which dead organic matter is broken down into simpler organic or inorganic substances. This process is primarily carried out by microorganisms such as bacteria and fungi.

2. **Identifying Factors Affecting Decomposition**:
- The rate of decomposition is influenced by several factors, which can be broadly categorized into:
- **Chemical Composition of Detritus**: The type of organic material that is decomposing affects how quickly it breaks down. For example, materials rich in nitrogen decompose faster than those that are high in lignin.
- **Climatic Factors**: Environmental conditions such as temperature, moisture, and pH play a significant role in the rate of decomposition. Warmer temperatures and adequate moisture generally accelerate the process.
- **Nature of Detritus**: This refers to the physical and chemical characteristics of the dead organic material. However, this is often encompassed in the chemical composition.

3. **Evaluating the Options**:
- **Option A: Chemical Composition of Detritus** - This is a correct factor influencing decomposition.
- **Option B: Climatic Factors** - This is also a correct factor influencing decomposition.
- **Option C: Both A and B** - Since both the chemical composition and climatic factors affect decomposition, this option is correct.
- **Option D: Nature of Detritus** - This is somewhat misleading as it is not a distinct factor separate from the chemical composition. Thus, it is incorrect in the context of the question.

4. **Conclusion**:
- The correct answer to the question "The rate of decomposition is controlled by" is **Option C: Both A and B**.