How the meristems are classified ?

Explanation

### Step-by-Step Solution

1. **Definition of Meristem**:
- Meristem is a specialized region in plants where active cell division occurs, allowing for growth and development.

2. **Classification Based on Origin and Development**:
- Meristems can be classified into two main categories based on their origin and development:
- **Pro-meristem**: This is the initial meristematic tissue that gives rise to other types of meristems.
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