Maximum quantity of humus occurs in

Options

A. Lowermost layer of soil
B. Upper layer of soil
C. Middle layer of soil
D. Same everywhere

Answer

**Step-by-Step Solution:**

1. **Understanding Humus**: Humus is the organic component of soil formed by the decomposition of leaves and other plant materials. It plays a crucial role in soil fertility and structure.

2. **Identifying Soil Layers**: Soil is typically divided into different layers:
- The **upper layer** (topsoil)
- The **middle layer** (subsoil)
- The **lowest layer** (bedrock or parent material)

3. **Location of Humus**: The maximum quantity of humus is found in the **upper layer of soil**. This is because the upper layer is where most organic matter accumulates due to the decay of living organisms, such as plants and microorganisms.

4. **Decomposition Process**: In the upper layer, the decomposition of organic materials occurs, leading to the formation of humus. This process is facilitated by various organisms, including bacteria, fungi, and earthworms.

5. **Conclusion**: Given the options provided:
- Lowest layer of soil: Incorrect, as it lacks organic matter.
- Upper layer of soil: Correct, as it contains the highest amount of humus.
- Middle layer of soil: Incorrect, as it has less organic matter compared to the upper layer.
- Same everywhere: Incorrect, as humus concentration varies with soil depth.

Thus, the correct answer is that the maximum quantity of humus occurs in the **upper layer of soil**.

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