Vascular cambium ring is constituted by

Options

A. Interfascicular and cork cambium
B. Intrafascicular and cork cambium
C. Intrafascicular and interfascicular cambium
D. Only cork cambium

Answer

To answer the question "Vascular cambium ring is constituted by," we will follow a step-by-step approach to understand the components of the vascular cambium ring.

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- The vascular cambium is a type of lateral meristem found in plants, responsible for secondary growth. It is located between the xylem and phloem tissues.

2. **Identifying Components of Vascular Cambium**:
- The vascular cambium consists of two main types of cambium:
- **Intrafascicular Cambium**: This is the cambium that is found within the vascular bundles. It is responsible for the formation of secondary xylem (wood) and secondary phloem.
- **Interfascicular Cambium**: This is the cambium that forms between the vascular bundles. It develops from the parenchyma cells in the medullary rays and contributes to the cambium ring.

3. **Formation of Cambium Ring**:
- In dicot stems, the vascular bundles are arranged in a ring. The cambium ring is formed by the combination of both intrafascicular and interfascicular cambium.
- During secondary growth, the interfascicular cambium connects the intrafascicular cambium from adjacent vascular bundles, thus forming a continuous ring.

4. **Conclusion**:
- The vascular cambium ring is constituted by the combination of **intrafascicular cambium** and **interfascicular cambium**.

### Final Answer:
The vascular cambium ring is constituted by **intrafascicular and interfascicular cambium**.

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