Mycorrhiza is an assoication between :

Options

A. Higher plant roots and Glomus
B. Algae and fungi
C. Protozoan and algae
D. Leguminous roots and Rhizobium

Answer

**Step-by-Step Solution:**

1. **Understanding Mycorrhiza**: Mycorrhiza refers to a symbiotic association between two different organisms. In this case, it specifically involves a relationship between fungi and the roots of green plants.

2. **Identifying the Organisms**: The two organisms involved in mycorrhizal associations are:
- **Green Plants**: These are higher plants that have roots.
- **Fungi**: Specifically, a type of fungus that forms a symbiotic relationship with the roots of these plants.

3. **Function of Mycorrhiza**: In this symbiotic relationship:
- The fungus benefits by receiving carbohydrates and nutrients from the plant.
- The plant benefits from the fungus as it helps in the absorption of water and essential minerals from the soil.

4. **Analyzing Options**:
- Option 1 states "higher plant roots and glomus," which is correct since Glomus is a genus of fungi that forms mycorrhizal associations with plant roots.
- Option 2 mentions "Algae and Fungi," which refers to Lichens, not mycorrhizae.
- Option 3 refers to "Protozoan and Algae," which does not relate to mycorrhizae.
- Option 4 mentions "leguminous roots and rhizobium," which is a different type of symbiotic relationship (not mycorrhiza).

5. **Conclusion**: Based on the analysis, the correct answer to the question is **Option 1: Higher plant roots and Glomus**.

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