Which one of the following is not a lateral meristem

Options

A. Intrafascicular cambium
B. Interfascicular cambium
C. Phellogen
D. Intercalary meristem

Answer

To determine which of the following options is not a lateral meristem, we need to analyze each option provided:

1. **Intrafascicular Cambium**: This is a type of lateral meristem found between the xylem and phloem in vascular bundles. It contributes to secondary growth by producing secondary xylem and phloem.

2. **Interfascicular Cambium**: This is another lateral meristem that forms between the vascular bundles in dicotyledonous plants. It also plays a role in secondary growth, contributing to the increase in girth of the plant.

3. **Phloem**: While phloem is part of the vascular tissue system, it is not classified as a meristem. It is responsible for the transport of nutrients and is not involved in meristematic activity.

4. **Intercalary Meristem**: This type of meristem is located at the base of leaves or internodes, particularly in grasses. It allows for growth in length and is considered a primary meristem, not a lateral meristem.

Based on this analysis, the answer to the question "Which one of the following is not a lateral meristem?" is **Intercalary Meristem**.

### Step-by-Step Solution:
1. **Identify the types of meristems**: Understand the difference between lateral meristems (which contribute to secondary growth) and primary meristems (which contribute to primary growth).
2. **Analyze each option**:
- **Intrafascicular Cambium**: Lateral meristem.
- **Interfascicular Cambium**: Lateral meristem.
- **Phloem**: Not a meristem.
- **Intercalary Meristem**: Primary meristem, not lateral.
3. **Determine the correct answer**: Since intercalary meristem is the only option that is not a lateral meristem, it is the correct answer.

### Final Answer:
The correct option is **Intercalary Meristem**.