When xylem and phloem are on same radius, the vascular bundles are said to be:-

Options

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

Answer

To answer the question regarding the arrangement of xylem and phloem in vascular bundles, we can follow these steps:

### Step-by-Step Solution:

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

2. **Identify Types of Vascular Bundles**: There are different types of vascular bundles based on the arrangement of xylem and phloem:
- **Radial Vascular Bundles**: In these bundles, xylem and phloem are arranged alternately. This means they are not on the same radius.
- **Conjoined Vascular Bundles**: In these bundles, xylem and phloem are located on the same radius. This type can be further divided into:
- **Collateral Bundles**: Where phloem is on the outer side and xylem is on the inner side.
- **Concentric Bundles**: Where either xylem surrounds phloem or vice versa.

3. **Analyze the Question**: The question specifically asks about the scenario when xylem and phloem are on the same radius. This directly points towards the conjoined vascular bundles.

4. **Select the Correct Answer**: Based on the analysis, when xylem and phloem are on the same radius, the vascular bundles are said to be **conjoined vascular bundles**.

### Final Answer:
The vascular bundles are said to be **conjoined vascular bundles** when xylem and phloem are on the same radius.

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