Which of the following types of vascular bundles are found in a monocot root ?

Options

A. Collateral , conjoint and closed
B. Radial vascular bundle with exarch xylem
C. Bicollateral, conjoint and closed
D. Radial vascular bundle with endarch xylem

Answer

To determine the types of vascular bundles found in a monocot root, we can analyze the characteristics of monocot roots and the types of vascular bundles.

### Step-by-Step Solution:

1. **Understand Vascular Bundles**: Vascular bundles are arrangements of xylem and phloem in plants. They can be classified based on their arrangement and the presence or absence of cambium.

2. **Identify Types of Vascular Bundles**:
- **Collateral**: Xylem and phloem are located on the same side.
- **Bicollateral**: Two phloem tissues are present on both sides of the xylem.
- **Conjoined**: Xylem and phloem are found together in the same bundle.
- **Radial**: Xylem and phloem are arranged alternately, typically found in roots.
- **Closed**: No cambium present, meaning the vascular bundle cannot produce secondary growth.
- **Open**: Cambium is present, allowing for secondary growth.

3. **Characteristics of Monocot Roots**:
- In monocot roots, the vascular bundles are typically radial.
- The protoxylem faces the pericycle, and the arrangement of xylem and phloem is such that they are alternately arranged.

4. **Conclusion**: Based on the characteristics of monocot roots, the type of vascular bundle found is **radial vascular bundles**.

5. **Final Answer**: The correct option is **radial vascular bundle with exact xylem**.