Name one function and one deficiency symptom of the following elements :
chlorine

Explanation

**Step-by-Step Solution:**

1. **Identify the Element**: The element in question is chlorine (Cl).

2. **State One Function of Chlorine**:
- Chlorine plays a crucial role in osmotic and stomatal regulation. It helps maintain the balance of water within the plant cells and regulates the opening and closing of stomata, which are essential for gas exchange during photosynthesis.

3. **Explain the Importance of the Function**:
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