Mycorrhizae show :

Options

A. Amensalism
B. Parasitism
C. Commensalism
D. Symbiosis

Explanation

To answer the question "Mycorrhizae show:", we need to analyze what mycorrhizae are and the type of relationship they represent.

### Step-by-Step Solution:

1. **Understanding Mycorrhizae**:
- Mycorrhizae are a symbiotic association between fungi and the roots of higher plants. This means that both organisms involved in this relationship benefit from each other.

2. **Identifying the Benefits**:
- The fungus provides essential nutrients, particularly phosphorus, to the plant. This nutrient is crucial for the plant's growth and development.
- In return, the plant supplies carbohydrates (food) to the fungus, which it produces through photosynthesis.

3. **Defining Symbiotic Relationships**:
- A symbiotic relationship is one where both parties benefit. This is different from other types of ecological interactions such as:
- **Amensalism**: One species is harmed while the other is unaffected.
- **Parasitism**: One species benefits at the expense of the other.
- **Commensalism**: One species benefits while the other is neither helped nor harmed.

4. **Conclusion**:
- Since mycorrhizae involve a mutual benefit to both the fungus and the plant, it is classified as a **symbiotic relationship**.

5. **Final Answer**:
- Mycorrhizae show **symbiosis**.