Which of the following statement is INCORRECT ?

Options

A. The process of decomposition is anaerobic.
B. Decomposition rate is low if detritus is rich in lingnin and chitin.
C. Decomposition rate is fast if detritus is rich in sugars.
D. Degradation of humus by microbes is called mineralization.

Answer

To determine which statement is incorrect, we will analyze each statement related to the process of decomposition.

### Step-by-Step Solution:

1. **Understanding Decomposition**:
- Decomposition is the process of breaking down complex organic matter into simpler inorganic substances such as carbon dioxide, water, and nutrients.

2. **Evaluating the First Statement**:
- The first statement claims that "The process of decomposition is anaerobic."
- However, decomposition primarily occurs in the presence of oxygen (aerobic conditions). While some decomposition can occur anaerobically, the majority of the process is aerobic. Therefore, this statement is incorrect.

3. **Evaluating the Second Statement**:
- The second statement discusses factors affecting the rate of decomposition, specifically mentioning that it depends on the chemical composition of detritus.
- This statement is correct as the breakdown of detritus (dead plant and animal matter) is influenced by its chemical makeup.

4. **Evaluating the Third Statement**:
- The third statement mentions that decomposition is largely an oxygen-requiring process.
- This is also correct, as oxygen is essential for the aerobic decomposition process.

5. **Evaluating the Fourth Statement**:
- The fourth statement indicates that decomposition is slower when detritus is rich in lignin and chitin.
- This statement is accurate because lignin and chitin are complex compounds that decompose slowly.

6. **Conclusion**:
- After evaluating all the statements, we conclude that the first statement is incorrect because it incorrectly categorizes decomposition as an anaerobic process when it is primarily aerobic.

### Final Answer:
The incorrect statement is: "The process of decomposition is anaerobic."

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