Name a plant seed having obligate association with the mycorrihiza means that can not germinate and establish without the pressence of mycorrhiza.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a specific plant seed that has an obligate association with mycorrhiza, meaning it cannot germinate or establish without the presence of mycorrhiza.

2. **Defining Mycorrhiza**: Mycorrhiza refers to a symbiotic association between fungi and plant roots. In this relationship, the fungi provide essential nutrients to the plant, while the plant supplies carbohydrates to the fungi.

3. **Identifying the Plant Seed**: The plant seed that is known for having an obligate association with mycorrhiza is the **Pinus seed**.

4. **Explaining the Relationship**: Pinus seeds rely on mycorrhiza to absorb extra nutrients from the soil. Without mycorrhiza, these seeds cannot germinate or grow effectively, as they lack the necessary nutrients.

5. **Conclusion**: Therefore, the answer to the question is that the **Pinus seed** cannot germinate and establish without the presence of mycorrhiza.