Mycorrhizae are the example of :

Options

A. Fungistasis
B. Amensalism
C. Antibiosis
D. Mutualism

Answer

### Step-by-Step Solution:

1. **Understanding Mycorrhizae**: Mycorrhizae refers to the symbiotic association between fungi and the roots of higher plants. This relationship is crucial for the growth and health of many plants.

2. **Identifying the Partners**: In this association, the two partners are:
- The roots of higher plants (such as potato and tomato).
- The fungi, primarily from the Glomus species.

3. **Function of Each Partner**:
- The plant roots provide carbohydrates, nutrients, and energy to the fungi.
- The fungi, in return, absorb water and essential minerals from the soil, which they share with the plant.

4. **Type of Relationship**: The relationship between the plant and the fungi is beneficial for both parties. This type of interaction is classified as mutualism, where both organisms gain benefits from the association.

5. **Conclusion**: Therefore, mycorrhizae are an example of mutualism, as both the fungi and the plant roots benefit from their interaction.

### Final Answer:
Mycorrhizae are an example of D. Mutualism.

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