Bicollateral vascular bundles are

Options

A. Always open
B. Provided with bundle sheath
C. Devoid of companion cells in phloem element
D. Bundles with a phloem group

Answer

### Step-by-Step Solution:

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

2. **Defining Bicollateral Vascular Bundles**:
- Bicollateral vascular bundles are a specific arrangement of vascular tissues where there is one xylem located between two phloem tissues. This means that there are two layers of phloem surrounding a single layer of xylem.

3. **Characteristics of Bicollateral Vascular Bundles**:
- One of the key characteristics of bicollateral vascular bundles is that they are "open". This means that the vascular tissues are capable of continuous growth and can transport materials effectively.

4. **Identifying the Correct Option**:
- Given the characteristics of bicollateral vascular bundles, the correct answer to the question is that they are always open. Other options that mention features like "bundle sheath devoid of companion cells" or "bundles with a phloem group" are incorrect.

5. **Conclusion**:
- Therefore, the correct answer is that bicollateral vascular bundles are always open.