Xylem and phloem lie together on same radius in collateral/radical type of vascular tissue system.

Answer

**Step-by-Step Solution:**

1. **Understanding Vascular Tissue Systems**:
- Vascular tissue in plants consists of xylem and phloem. Xylem is responsible for water and mineral transport, while phloem transports nutrients and sugars.

2. **Identifying Types of Vascular Bundles**:
- There are two main types of vascular bundles: collateral and radial.
- In **collateral vascular bundles**, xylem and phloem are located on the same radius, meaning they are positioned next to each other.
- In **radial vascular bundles**, xylem and phloem are arranged alternately and are located at different radii.

3. **Analyzing the Question**:
- The question asks whether xylem and phloem lie together on the same radius in collateral or radial type of vascular tissue system.

4. **Conclusion**:
- Since xylem and phloem are together on the same radius, this indicates that the vascular tissue system in question is **collateral**.

5. **Final Answer**:
- The answer is **collateral vascular bundle**.

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