A complete ring a vascular cambium in dicot stem is formed by the combination of

Options

A. interfascicula cambicum and cork camlum
B. intefascicular and intrascicular cambium
C. interfascicular cambium and procabium
D. fascicular combium and cork cabium

Answer

To solve the question regarding the formation of a complete ring of vascular cambium in a dicot stem, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- Vascular cambium is a type of lateral meristem responsible for the secondary growth in plants, particularly in dicots. It is crucial for the formation of secondary xylem (wood) and secondary phloem (bark).

2. **Identifying Types of Cambium**:
- There are two main types of cambium involved in the formation of the vascular cambium:
- **Intrafascicular Cambium**: This is the cambium present within the vascular bundles. It is derived from the primary meristem.
- **Interfascicular Cambium**: This is the cambium that forms in the regions between the vascular bundles. It is derived from the secondary meristem.

3. **Formation of the Complete Ring**:
- In dicot stems, during secondary growth, the intrafascicular cambium and interfascicular cambium join together to form a complete ring of vascular cambium. This ring encircles the stem and allows for continuous growth in thickness.

4. **Conclusion**:
- Therefore, the correct answer to the question is that a complete ring of vascular cambium in dicot stems is formed by the combination of **intrafascicular cambium and interfascicular cambium**.

### Final Answer:
The complete ring of vascular cambium in dicot stem is formed by the combination of **intrafascicular cambium and interfascicular cambium** (Option 2).

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