Which one of the following elements (miconutrients) in plants is not remobilised ?

Options

A. Phosphorus
B. Calcium
C. Potassium
D. Sulphur

Answer

To determine which micronutrient in plants is not remobilized, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification of Nutrients**:
- Nutrients are classified into macronutrients and micronutrients based on the quantity required by plants. Macronutrients are needed in larger amounts, while micronutrients are required in smaller quantities.

2. **Identify Micronutrients**:
- Common micronutrients include boron, copper, iron, manganese, molybdenum, nickel, and zinc.

3. **Differentiate Between Mobile and Immobile Nutrients**:
- Nutrients can also be classified based on their mobility within the plant. Mobile nutrients can be transferred from older leaves to younger leaves, while immobile nutrients cannot be moved once they are incorporated into plant structures.

4. **List Examples of Mobile and Immobile Nutrients**:
- **Mobile Nutrients**: Potassium, phosphorus, magnesium, and chlorine.
- **Immobile Nutrients**: Calcium, sulfur, iron, boron, and copper.

5. **Focus on Calcium**:
- Among the micronutrients, calcium is known to be immobile. It is a crucial component of the cell wall and becomes integrated into the structure, making it unable to be remobilized within the plant.

6. **Conclusion**:
- Therefore, the micronutrient that is not remobilized in plants is **Calcium**.

### Final Answer:
**Calcium** is the micronutrient in plants that is not remobilized.

---