Which one of the following is not a lateral meristem

Options

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

Answer

To solve the question "Which one of the following is not a lateral meristem?" we will analyze the options provided and understand the definitions and functions of different types of meristems.

### Step-by-Step Solution:

1. **Understand Meristems**:
- Meristems are regions in plants where cells are actively dividing to form new tissues. They are crucial for growth and development.

2. **Types of Meristems**:
- Meristems can be classified into three main types:
- **Apical Meristem**: Located at the tips of roots and shoots, responsible for primary growth (growth in length).
- **Lateral Meristem**: Responsible for secondary growth (growth in thickness). This includes the cambium.
- **Intercalary Meristem**: Found at the base of leaves and internodes, contributing to growth in length.

3. **Analyze the Options**:
- **Intrafascicular Cambium**: A type of lateral meristem located between xylem and phloem in vascular bundles.
- **Interfascicular Cambium**: Another type of lateral meristem found between vascular bundles.
- **Callus**: This is not a meristem but a mass of undifferentiated cells that can form in response to injury.
- **Intercalary Meristem**: This is located at the base of leaves and internodes, contributing to growth in length, and is not classified as a lateral meristem.

4. **Identify the Correct Answer**:
- Among the options, the **Intercalary Meristem** is the one that is not a lateral meristem. It is instead associated with primary growth.

### Conclusion:
The correct answer is **Intercalary Meristem**.

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