Closed vascular bundles lack

Options

A. Cambium
B. Pith
C. Ground tissue
D. Conjunctive tissue

Answer

### Step-by-Step Text Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are arrangements of xylem and phloem in plants. They are crucial for the transport of water, nutrients, and food.

2. **Types of Vascular Bundles**: Vascular bundles can be classified as open or closed. Open vascular bundles contain cambium, which is a layer of meristematic tissue that allows for the formation of secondary xylem and phloem.

3. **Closed Vascular Bundles**: In contrast, closed vascular bundles do not have cambium. This means they lack the ability to form secondary tissues, which limits their growth in thickness.

4. **Identifying the Key Feature**: The defining characteristic of closed vascular bundles is the absence of cambium. This absence means that there is no meristematic tissue present between the xylem and phloem.

5. **Conclusion**: Therefore, the answer to the question "Closed vascular bundles lack" is **cambium**.