Select correct matched pair

Options

A. Nutrient-Magnesium , Functions-Helps to maintain ribosome structure
B. Nutrient-Zinc , Functions-Needed during formation of mitotic spindle
C. Nutrient-Manganese , Functions-Plays a role in opening and closing of stomata
D. Nutrient-Potassium , Functions-Needed in the splitting of water to liberate oxygen

Answer

To solve the question of selecting the correct matched pair of nutrients and their functions, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the Categories of Nutrients**:
- Nutrients essential for plants are divided into two categories:
- **Macronutrients**: Needed in large amounts (e.g., Calcium, Magnesium, Potassium, Phosphorus).
- **Micronutrients**: Needed in very small amounts (e.g., Boron, Zinc, Iron, Nickel).

2. **Analyze Each Option**:
- **Option 1: Magnesium**
- Description: Helps to maintain ribosome structure.
- Function: Acts as an activator for some enzymes and is a constituent of chlorophyll.
- **Conclusion**: This match is correct.

- **Option 2: Zinc**
- Description: Activates some enzymes and is needed for the synthesis of auxin.
- Function: Required for mitotic spindle formation.
- **Conclusion**: This match is incorrect as it does not accurately describe the role of Zinc.

- **Option 3: Manganese**
- Description: Plays a role in opening and closing of stomata.
- **Conclusion**: This match is incorrect. The nutrient responsible for this function is Potassium, not Manganese.

- **Option 4: Potassium**
- Description: Needed in the splitting of water to liberate Oxygen.
- **Conclusion**: This match is incorrect. The nutrient responsible for splitting water is Magnesium.

3. **Final Decision**:
- After analyzing all options, the only correct matched pair is **Option 1: Magnesium**.

### Final Answer:
The correct matched pair is **Magnesium - Helps to maintain ribosome structure**.