In mycorrhizae the fungus provides minerals and water to the roots, in turn the roots provide

Options

A. sugars and N-containing compounds
B. sugars and S-containing compounds
C. sugars and P-containing compounds
D. sugars and K-containing compounds

Explanation

### Step-by-Step Solution:

1. **Understanding Mycorrhizae**: Mycorrhizae is a symbiotic association between fungi and plant roots. In this relationship, both organisms benefit from each other.

2. **Role of Fungi**: The fungi in mycorrhizae provide essential minerals and water to the plant roots. They absorb these nutrients from the soil and transfer them to the plant.

3. **Role of Plant Roots**: In return, the plant roots provide the fungi with organic compounds, primarily sugars (carbohydrates) and nitrogen-containing compounds. These compounds are products of photosynthesis in the plant.

4. **Analyzing the Options**:
- **Option A**: Sugars and nitrogen-containing compounds - This matches the role of the plant roots.
- **Option B**: Sugars and sulfur-containing compounds - This is incorrect as sulfur is not the primary compound provided.
- **Option C**: Sugars and phosphorus-containing compounds - While phosphorus is important, it is not the main compound provided by the roots to the fungi.
- **Option D**: Sugars and potassium-containing compounds - This is also incorrect as potassium is not primarily provided in this symbiotic relationship.

5. **Conclusion**: The correct answer is **Option A: Sugars and nitrogen-containing compounds**. This reflects the nutrients that plant roots provide to the fungi in mycorrhizae.