The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:-

Options

A. Detritus rich in sugars
B. Warm and moist environment
C. Presence of aerobic soil microbes
D. Detritus richer in lignin and chitin

Answer

To solve the question regarding the factors affecting the rate of decomposition in an ecosystem, we need to analyze each option provided and determine which one does not contribute to a faster rate of decomposition.

### Step-by-Step Solution:

1. **Understanding Decomposition**: Decomposition is the process by which organic substances are broken down into simpler organic or inorganic matter. This process is crucial for nutrient cycling in ecosystems.

2. **Analyzing Option A**:
- **Statement**: Detritus rich in sugar.
- **Explanation**: Sugars are water-soluble and easily utilized by decomposers. Therefore, detritus rich in sugar would enhance the rate of decomposition.
- **Conclusion**: This option does not lower the decomposition rate.

3. **Analyzing Option B**:
- **Statement**: Warm and moist environment.
- **Explanation**: Warmth and moisture are conducive to microbial activity, which accelerates decomposition. Cooler and drier conditions slow it down.
- **Conclusion**: This option also does not lower the decomposition rate.

4. **Analyzing Option C**:
- **Statement**: Presence of aerobic soil microbes.
- **Explanation**: Aerobic microbes require oxygen to decompose organic matter. Their presence increases the rate of decomposition as they efficiently break down materials.
- **Conclusion**: This option does not lower the decomposition rate.

5. **Analyzing Option D**:
- **Statement**: Detritus richer in lignin and chitin.
- **Explanation**: Lignin and chitin are complex macromolecules that are more resistant to decomposition. Their presence in detritus slows down the decomposition process.
- **Conclusion**: This option does lower the decomposition rate.

6. **Final Answer**: The correct answer is **Option D**: Detritus richer in lignin and chitin does not favor the decomposition process and thus is the exception.