Name the mineral element which is essential for proper growth of cell walls in plant cells.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a mineral element that is essential for the proper growth of cell walls in plant cells.

2. **Identifying the Mineral Element**: The mineral element that is crucial for the development and integrity of plant cell walls is calcium.

3. **Role of Calcium in Plant Cells**:
- Calcium is absorbed by plants in the form of calcium ions (Ca²⁺).
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