Xylem and phloem are present on the same radius, such a vascular bundle is called -

Options

A. Radial
B. Bicollateral
C. Concentric
D. Conjoint

Answer

To answer the question "Xylem and phloem are present on the same radius, such a vascular bundle is called -", we can follow these steps:

### 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. **Identifying the Arrangement**: The question specifies that xylem and phloem are present on the same radius. This means that they are positioned next to each other in the same cross-sectional plane of the stem or root.

3. **Types of Vascular Bundles**:
- **Radial**: In this arrangement, xylem and phloem are located on different radii. This is typically seen in roots.
- **Collateral**: In this arrangement, xylem and phloem are on the same radius, but phloem is located outside the xylem.
- **Bicolateral**: This is a specific type of collateral where phloem is present on both sides of the xylem.
- **Concentric**: In this arrangement, one type of tissue surrounds the other, such as phloem surrounding xylem or vice versa.

4. **Identifying the Correct Term**: The question specifically asks for the scenario where xylem and phloem are on the same radius. The correct term for this arrangement, where both xylem and phloem are present together on the same radius, is "Conjoint".

5. **Conclusion**: Therefore, the correct answer to the question is that when xylem and phloem are present on the same radius, such a vascular bundle is called **Conjoint**.

### Final Answer:
**Conjoint**

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