Closed vascular bundles lack

Options

A. Cambium
B. Xylem
C. Pholem
D. Parenchyma

Answer

**Step-by-Step Solution:**

1. **Understanding Vascular Bundles**: Vascular bundles are the part of the plant that transports water, nutrients, and food. They are composed of xylem and phloem, which are responsible for the transport of water and nutrients, respectively.

2. **Types of Vascular Bundles**: There are two main types of vascular bundles:
- **Open Vascular Bundles**: These contain xylem and phloem with a cambium layer in between. The cambium is a layer of meristematic tissue that allows for growth in thickness.
- **Closed Vascular Bundles**: In these bundles, xylem and phloem are present, but there is no cambium layer between them.

3. **Characteristics of Closed Vascular Bundles**: In closed vascular bundles, the arrangement is such that:
- One side has xylem.
- The other side has phloem.
- There is no cambium present in between the xylem and phloem.

4. **Conclusion**: Since closed vascular bundles lack the cambium layer, the answer to the question "Closed vascular bundles lack" is **cambium**.

**Final Answer**: Closed vascular bundles lack cambium.

---