Select the mismatched pair out of the following

Options

A. Radial vascular bundle-Xylem and phloem on different radii
B. Bicollateral vascular bundle-Phloem present on both sides of xylem
C. Amphivasal vascular bundle- Phloem surrounds xylem
D. Conjoint vascular bundle-Xylem and phloem on same radii

Explanation

To solve the question of selecting the mismatched pair from the given options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Vascular Bundles**:
- Vascular bundles are classified based on the arrangement of xylem and phloem. Familiarize yourself with the definitions of radial, bicollateral, amphivasal, and conjoined vascular bundles.

2. **Analyze Each Option**:
- **Option 1: Radial Vascular Bundle**: In this type, xylem and phloem are located on different radii. This is correct.
- **Option 2: Bicollateral Vascular Bundle**: In this arrangement, phloem is present on both sides of the xylem. This is also correct.
- **Option 3: Amphivasal Vascular Bundle**: In this type, phloem is supposed to surround xylem. However, the statement claims that phloem surrounds xylem, which is incorrect. In reality, xylem is surrounded by phloem.
- **Option 4: Conjoined Vascular Bundle**: Here, xylem and phloem are located on the same radius. This is correct.

3. **Identify the Mismatched Pair**:
- After analyzing all options, it is clear that the third option (Amphivasal Vascular Bundle) is mismatched because it incorrectly states the arrangement of xylem and phloem.

4. **Conclusion**:
- The mismatched pair is found in option 3, where the description of the amphivasal vascular bundle is incorrect.

### Final Answer:
The mismatched pair is **Option 3: Amphivasal Vascular Bundle**.

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