Define meristematic tissue.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Meristematic Tissue**: Meristematic tissue is a type of plant tissue that is responsible for the growth of the plant.

2. **Characteristics of Meristematic Cells**:
- **Size**: The cells are generally small in size.
- **Cell Wall**: They have thin cell walls.
- **Protoplasm**: The protoplasm within these cells is dense.
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