What are open type of collateral vascular bundles?

Explanation

**Step-by-Step Solution:**

1. **Understanding Vascular Bundles**: Vascular bundles are the structures that transport water, nutrients, and food in plants. They are primarily composed of xylem and phloem.

2. **Types of Vascular Bundles**: Vascular bundles can be classified into three main types:
- Radial vascular bundles
- Conjoined vascular bundles
- Concentric vascular bundles
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