Some vascular bundles are described as open because these

Options

A. are srrounded by pericylce but not endodermis
B. are capable of producing secondary xylem and phloem
C. posses conjunctive tissue between xylem and phloem
D. are not surrounded by pericycle

Answer

To answer the question "Some vascular bundles are described as open because these:", we need to analyze the options provided and understand the characteristics of open vascular bundles.

### Step-by-Step Solution:

1. **Understanding Vascular Bundles**: Vascular bundles are structures in plants that contain xylem and phloem, which are responsible for the transport of water, nutrients, and food.

2. **Definition of Open Vascular Bundles**: Open vascular bundles have a cambium layer present between the xylem and phloem. Cambium is a layer of meristematic cells that can divide and differentiate into new xylem and phloem cells.

3. **Identifying the Correct Option**:
- **Option A**: "Are surrounded by a pericycle but not endodermis" - This is not relevant to the definition of open vascular bundles.
- **Option B**: "Are capable of producing secondary xylem and phloem" - This is true because the presence of cambium allows for the production of secondary xylem and phloem, which characterizes open vascular bundles.
- **Option C**: "Possess conjunctive tissue between xylem and phloem" - While some vascular bundles may have conjunctive tissue, this does not define them as open.
- **Option D**: "Are not surrounded by a pericycle" - This is not a defining characteristic of open vascular bundles.

4. **Conclusion**: The correct answer is **Option B**: "Are capable of producing secondary xylem and phloem."