Which element helps to maintain an anion-cation balance in cells and is involved in protein synthesis?

Options

A. Cu
B. Mg
C. CI
D. K

Answer

To answer the question "Which element helps to maintain an anion-cation balance in cells and is involved in protein synthesis?", we can follow these steps:

### Step 1: Understand the Role of Elements in Plants
We need to identify which elements are essential for maintaining anion-cation balance and are involved in protein synthesis.

### Step 2: Analyze the Options
- **Copper**: While it is essential for photosynthesis and respiration, it does not primarily maintain anion-cation balance or directly contribute to protein synthesis.
- **Magnesium**: It is crucial for chlorophyll formation and photosynthesis but does not directly maintain anion-cation balance or protein synthesis.
- **Chlorine**: It plays a role in osmotic regulation and stomatal function but is not primarily involved in protein synthesis.
- **Potassium**: This element is known to maintain anion-cation balance in cells and is also involved in the activation of enzymes and protein synthesis.

### Step 3: Conclusion
Based on the analysis, the correct answer is **Potassium** (Option D). Potassium helps maintain the balance of anions and cations in plant cells and plays a significant role in protein synthesis.