In radial vascular bundles, xylem and phloem patches occur in ........... patches.

Answer

**Step-by-Step Solution:**

1. **Understanding Radial Vascular Bundles**: Radial vascular bundles are a type of vascular arrangement found in certain plants. In these bundles, the xylem and phloem are arranged in a specific pattern.

2. **Arrangement of Xylem and Phloem**: In radial vascular bundles, the xylem and phloem occur in an alternate manner. This means that they are positioned one after the other, rather than being grouped together.

3. **Positioning in Different Radii**: The xylem and phloem patches are located at different radii from the center of the bundle. This arrangement allows for efficient transport of water and nutrients.

4. **Occurrence in Plant Types**: Radial vascular bundles are commonly found in the roots of both dicots and monocots. This is important for understanding the structural differences in plant anatomy.

5. **Final Answer**: Therefore, in radial vascular bundles, xylem and phloem occur in alternate patches.

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