Four radial V.B. are found in : -

Options

A. Dicot root
B. Monocot root
C. Dicot stem
D. Monocot stem

Answer

To solve the question regarding where four radial vascular bundles (VB) are found, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Vascular Bundles (VB)**:
- Vascular bundles are structures in plants that contain xylem and phloem, which are responsible for the transport of water, nutrients, and food.

2. **Identify Types of Vascular Bundles**:
- Vascular bundles can be arranged in different ways, such as:
- Conjoint (xylem and phloem are together)
- Radial (xylem and phloem are arranged alternately)

3. **Examine the Options**:
- The question provides options that include dicot stem, monocot stem, dicot root, and monocot root.

4. **Analyze Dicot and Monocot Structures**:
- In **dicot stems**, vascular bundles are typically arranged in a conjoint manner.
- In **monocot stems**, vascular bundles are also conjoint.
- In **dicot roots**, vascular bundles are arranged radially and can range from 2 to 6 in number (diarc to hexarc).
- In **monocot roots**, vascular bundles are also arranged radially but typically occur in pairs (2).

5. **Determine the Correct Answer**:
- Since the question specifies "four radial vascular bundles," we need to find a structure that has exactly four.
- In dicot roots, it is possible to have four vascular bundles arranged radially, which is referred to as a tetrarch condition.
- In monocot roots, the vascular bundles are usually 2 in number, hence not applicable.

6. **Conclusion**:
- Therefore, the correct answer is that four radial vascular bundles are found in the **dicot root**.

### Final Answer:
- **The correct answer is: Dicot root (Option A)**.