In an interspecific a filamentous eukaryotic organism absorbs nutrients from the soil for the higher plant. In turn the host provides some energy yielding carbohydrates, such association is called -

Answer

### Step-by-Step Solution:

1. **Identify the Organisms Involved**: The question describes an interaction between a filamentous eukaryotic organism (which is likely a fungus) and a higher plant.

2. **Understand the Nature of the Relationship**: The filamentous organism absorbs nutrients from the soil and provides them to the plant. In return, the plant provides energy-yielding carbohydrates to the fungus. This indicates a mutualistic relationship.

3. **Define the Type of Association**: The specific type of mutualistic association where fungi and plant roots interact is known as mycorrhiza.

4. **Explain Mycorrhiza**: In mycorrhiza, the fungus forms a symbiotic relationship with the roots of the plant. The fungus enhances nutrient absorption (especially phosphorus and nitrogen) for the plant, while the plant supplies carbohydrates (produced through photosynthesis) to the fungus.

5. **Conclude the Answer**: Therefore, the association described in the question is called **Mycorrhiza**.

### Final Answer:
The association is called **Mycorrhiza**.

---