Cambium ring in dicot system is

Options

A. Primary meristem only
B. Secondary meristem only
C. Primary and secondary meristems
D. Only fascicular cambium

Answer

### Step-by-Step Solution:

1. **Understanding Cambium**: The cambium is a type of meristematic tissue responsible for secondary growth in plants. It is crucial for the formation of secondary xylem (wood) and secondary phloem (bark).

2. **Types of Meristem**: There are two main types of meristems:
- **Primary Meristem**: Responsible for the initial growth of the plant (length).
- **Secondary Meristem**: Responsible for the growth in thickness (girth) of the plant.

3. **Formation of Cambium Ring**: The cambium ring in dicot stems is formed from:
- **Intrafascicular Cambium**: This is the cambium that is located between the primary xylem and primary phloem.
- **Interfascicular Cambium**: This is formed from the medullary rays, which connect the vascular bundles.

4. **Secondary Meristem**: Since the cambium ring is formed from the combination of the intrafascicular and interfascicular cambium, it is classified as a secondary meristem. This is because it contributes to the secondary growth of the plant, increasing its girth.

5. **Conclusion**: Therefore, the cambium ring in dicot stems is classified as a secondary meristem only.

### Final Answer:
The cambium ring in dicot stems is a **secondary meristem only**.

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