Mycorrhizal associations plays an important role in which of the following bio-geochemical cycle ?

Options

A. Carbon cycle
B. Sulphur cycle
C. Nitrogen cycle
D. Phosphorus cycle

Answer

To solve the question regarding the role of mycorrhizal associations in biogeochemical cycles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Mycorrhizae**:
- Mycorrhizae are symbiotic associations between fungi and the roots of higher plants. This relationship enhances nutrient uptake for the plants, particularly phosphorus.

2. **Identifying the Role of Fungi**:
- The fungal component of mycorrhizae, such as those from the genus Glomus, plays a crucial role in absorbing nutrients from the soil.

3. **Focusing on Nutrient Absorption**:
- The primary nutrient that mycorrhizal fungi absorb from the soil is phosphorus. This nutrient is essential for plant growth and development.

4. **Connecting to Biogeochemical Cycles**:
- The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. Since mycorrhizae facilitate the absorption of phosphorus and its transfer to plants, they play a significant role in this cycle.

5. **Conclusion**:
- Therefore, mycorrhizal associations are primarily involved in the phosphorus cycle.

### Final Answer:
Mycorrhizal associations play an important role in the **Phosphorus Cycle**.

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