radial vascular bundles occur in

Options

A. stem
B. monocot stem
C. dicot stem
D. root

Answer

### Step-by-Step Solution

1. **Understanding Vascular Bundles**: Vascular bundles are the part of the plant that contains the xylem and phloem, which are responsible for the transport of water, nutrients, and food throughout the plant.

2. **Types of Vascular Bundles**: There are several types of vascular bundles, including:
- **Collateral**: Xylem and phloem are located next to each other.
- **Bicollateral**: Two phloem and one xylem are present.
- **Concentric**: One type of vascular tissue surrounds the other.
- **Radial**: Xylem and phloem are arranged separately at different radii.

3. **Defining Radial Vascular Bundles**: Radial vascular bundles are characterized by the arrangement of xylem and phloem on different radii, separated by non-conductive tissues. This arrangement is referred to as a simple vascular bundle.

4. **Occurrence of Radial Vascular Bundles**: Radial vascular bundles are primarily found in the roots of both dicot and monocot plants. They are not typically found in the stems of these plants.

5. **Identifying the Correct Option**: Given the options provided, the correct answer to the question "radial vascular bundles occur in" is:
- **Roots of both dicot and monocot plants**.

### Final Answer
Radial vascular bundles occur in the roots of both dicot and monocot plants.

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