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A layer of soil profile is rich in...

A layer of soil profile is rich in

A

minerals

B

humus

C

litter

D

none of these

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Soil Profile**: The soil profile consists of different layers, each with distinct characteristics and compositions. The main layers include the O horizon, A horizon, B horizon, and C horizon. 2. **Identifying the O Horizon**: The topmost layer, known as the O horizon, is rich in organic matter such as decomposed leaves and twigs. This layer is crucial for the initial nutrient input into the soil. 3. **Analyzing the A Horizon**: Below the O horizon is the A horizon, which is also rich in organic material. This layer contains a significant amount of humus, which is formed from the decomposition of organic matter. Humus is vital for soil fertility as it enhances nutrient availability and improves soil structure. 4. **Examining the B Horizon**: The B horizon, or subsoil, lies beneath the A horizon. It is where minerals leached from the upper layers accumulate. While it does contain nutrients, it is not as rich in organic matter as the A horizon. 5. **Looking at the C Horizon**: The C horizon consists of weathered rock and parent material. It does not contain significant organic matter or humus. 6. **Conclusion**: Based on the characteristics of these layers, the A horizon is identified as the layer of soil profile that is rich in humus. Therefore, the correct answer to the question is that a layer of soil profile is rich in humus. ### Final Answer: A layer of soil profile is rich in **humus**.
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