Partially decomposed organic matter called duff is found in ................. horizon of soil profile :-

Options

A. `O_(1)//A_(00)`
B. `O_(2)//A_(0)`
C. `B_(1)`
D. `B_(2)`

Answer

**Step-by-Step Solution:**

1. **Understanding Soil Horizons**: The soil profile consists of various layers known as soil horizons. Each horizon has distinct characteristics and compositions.

2. **Identifying the Layers**: The main layers of the soil horizon include:
- **O Horizon**: This is the organic layer, rich in decomposed organic matter.
- **A Horizon**: Also known as topsoil, this layer contains a mixture of organic material and minerals.
- **B Horizon**: Known as subsoil, this layer is primarily composed of minerals leached from the upper layers.

3. **Defining Duff**: Duff refers to partially decomposed organic matter found in the soil. It is primarily composed of humus, which is formed from the decomposition of plant and animal material.

4. **Locating Duff in Soil Horizons**:
- The decomposition process begins in the O1 layer (the upper part of the O horizon) and continues into the O2 layer (the lower part of the O horizon).
- The A horizon (specifically A1 layer) also contains significant amounts of organic matter.

5. **Conclusion**: Since duff is partially decomposed organic matter, it is primarily found in the O horizon, particularly in the O2 layer and the A1 layer.

6. **Final Answer**: Thus, the correct answer to the question is that duff is found in the **O horizon** of the soil profile.

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