Release of inorganic nutrients from humus by microbes is

Options

A. Humification
B. Catabolism
C. Mineralization
D. Fragmentation

Answer

To solve the question regarding the release of inorganic nutrients from humus by microbes, we need to analyze the provided options one by one:

1. **Umification**: This term refers to the process of forming humic substances from organic matter. It is not directly related to the release of inorganic nutrients.

2. **Humic Substances**: This option describes organic matter that has reached maturity. While humic substances are important in the ecosystem, this term does not specifically refer to the process of nutrient release.

3. **Catabolism**: This is the process of breaking down complex molecules into simpler ones. While it involves degradation, it does not specifically refer to the release of inorganic nutrients from humus.

4. **Mineralization**: This is the correct term for the process where humus is further degraded by microbes to release inorganic nutrients. During mineralization, organic matter is broken down into its inorganic components, making nutrients available for plants and other organisms.

5. **Fragmentation**: This process involves breaking down detritus into smaller pieces but does not specifically relate to the release of inorganic nutrients.

Based on the analysis, the correct answer to the question is **mineralization**.

### Steps:
1. **Identify the process**: Understand what is meant by the release of inorganic nutrients from humus.
2. **Evaluate each option**: Go through each provided option and define them.
3. **Eliminate incorrect options**: Determine which options do not relate to the release of inorganic nutrients.
4. **Select the correct answer**: Choose the option that accurately describes the process of releasing inorganic nutrients from humus.