Which of the following of primary meristem

Options

A. Phellogen
B. Vascular cambium of root
C. Inter fascicular cambium
D. Intra fascicular cambium

Answer

To determine which of the following is a primary meristem, let's analyze each option step by step:

1. **Understanding Primary Meristem**: Primary meristems are tissues in plants that are responsible for the primary growth, which is the increase in length of the plant. They are derived from the apical meristem and include protoderm, ground meristem, and procambium.

2. **Analyzing the Options**:
- **Phallogen**: This is a type of cork cambium, which is involved in the formation of the periderm (the outer protective layer of the plant). It is classified as a lateral meristem, not a primary meristem.
- **Vascular Cambium of Root**: This is a lateral meristem that contributes to secondary growth by forming secondary xylem and phloem. It is not a primary meristem.
- **Interfascicular Cambium**: This is a type of cambium that forms between the vascular bundles in dicot stems. It is involved in secondary growth and is classified as a lateral meristem.
- **Intrafascicular Cambium**: This is found between the xylem and phloem within a vascular bundle in dicots. It is a primary meristem that contributes to the formation of vascular tissues.

3. **Conclusion**: Based on the analysis, the only option that qualifies as a primary meristem is the **Intrafascicular Cambium**.

### Final Answer:
The primary meristem among the options is **Intrafascicular Cambium**.