Mycorrhiza generally occurs in

Options

A. Alkaline soils
B. Acidic soils
C. Oligotrophic soils
D. Eutrophic soils

Answer

**Step-by-Step Solution:**

1. **Understanding Mycorrhizae**: Mycorrhizae are symbiotic associations between fungi and plant roots. They play a crucial role in nutrient absorption and enhance plant growth.

2. **Identifying Soil Types**: The question presents four types of soil: alkaline, acidic, oligotrophic, and eutrophic. We need to determine which type is generally preferred by mycorrhizae.

3. **Characteristics of Oligotrophic Soil**: Oligotrophic soils are characterized by low nutrient levels and are often found in environments that provide a balance of moisture and organic matter. They are suitable for the growth of mycorrhizae because they can utilize dead and decaying material as a food source.

4. **Comparison with Other Soil Types**:
- **Alkaline Soil**: Typically has a high pH and may not provide the necessary conditions for mycorrhizal growth.
- **Acidic Soil**: While some mycorrhizae can thrive in acidic conditions, they generally prefer environments that are not overly acidic.
- **Eutrophic Soil**: This type of soil is rich in nutrients, which may not be ideal for mycorrhizae that thrive in nutrient-poor conditions.

5. **Conclusion**: Based on the characteristics of mycorrhizae and the types of soil, oligotrophic soil is the most suitable environment for their growth due to its low nutrient content and availability of organic matter.

**Final Answer**: Mycorrhiza generally occurs in oligotrophic soil.

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