When patches of phloem occur on both sides of xylem, then vascular bundle is called as

Options

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

Answer

To solve the question, "When patches of phloem occur on both sides of xylem, then vascular bundle is called as," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Vascular Bundles**: Vascular bundles are structures in plants that contain xylem and phloem, which are responsible for transporting water, nutrients, and food.

2. **Identify the Types of Vascular Bundles**:
- **Radial**: In this type, xylem and phloem are located on different radii. This means they are separated and not adjacent to each other.
- **Collateral**: Here, xylem and phloem are found on the same radius, with xylem located towards the inner side and phloem on the outer side.
- **Bicolateral**: This type has phloem located on both sides of the xylem. So, there are patches of phloem on either side of the central xylem.
- **Concentric**: This type has one type of tissue surrounding the other, such as phloem surrounding xylem or vice versa.

3. **Analyze the Question**: The question specifically mentions that there are patches of phloem on both sides of the xylem. This description matches the definition of bicolateral vascular bundles.

4. **Select the Correct Answer**: Based on the definitions and the analysis, the correct answer to the question is **bicolateral**.

### Final Answer:
The vascular bundle is called **bicolateral** when patches of phloem occur on both sides of xylem.

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