Buildup of organic material in soil is under which of the following conditions to

Options

A. `lt 10^@ C` temperature , Absence of oxygen
B. Warm temperature, Humid environment
C. Aerobic conditions , `gt 25^@C` temperautre
D. Nitrogen rich detritus, optimum moisture

Answer

### Step-by-Step Solution:

1. **Understanding Organic Material in Soil**:
Organic material in soil primarily consists of three components:
- Remains of fresh plants
- Decomposing matter
- Stable organic compounds

2. **Analyzing the Options**:
We need to evaluate each option to determine the conditions that favor the buildup of organic material in soil.

3. **Option 1**: Less than 10 degrees Celsius temperature and absence of oxygen.
- **Analysis**: Cold temperatures (less than 10 degrees Celsius) and lack of oxygen do not promote decomposition. Therefore, this option is not suitable for organic buildup.

4. **Option 2**: Warm temperature and humid environment.
- **Analysis**: While warmth and humidity are generally favorable for organic processes, this option lacks specificity regarding oxygen availability, which is crucial for decomposition. Thus, it is not the best choice.

5. **Option 3**: Aerobic condition and more than 25 degrees Celsius temperature.
- **Analysis**: This option provides both aerobic conditions (presence of oxygen) and a warm temperature (more than 25 degrees Celsius), which are essential for effective decomposition and the formation of stable organic compounds. This is the most appropriate condition for the buildup of organic material.

6. **Option 4**: Nitrogen-rich detritus optimum moisture.
- **Analysis**: While nitrogen-rich detritus and optimum moisture can support decomposition, this option does not specify temperature or oxygen conditions, making it less comprehensive compared to option 3.

7. **Conclusion**:
The best condition for the buildup of organic material in soil is found in **Option 3: Aerobic condition and more than 25 degrees Celsius temperature**.