Deficiency of which mineral does not cause necrosis?

Options

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

Answer

To solve the question "Deficiency of which mineral does not cause necrosis?" we will analyze the role of each mineral mentioned in the options: calcium, magnesium, potassium, and sulphur.

### Step-by-Step Solution:

1. **Understanding Necrosis**:
- Necrosis refers to the death of plant cells or tissues. It is often a symptom of disease or deficiency in essential nutrients.

2. **Analyzing Each Mineral**:
- **Calcium**: Calcium deficiency can lead to necrosis, particularly in the tips of young leaves and roots, as it is essential for cell wall structure and stability.
- **Magnesium**: Magnesium is crucial for chlorophyll production. Its deficiency can lead to chlorosis (yellowing of leaves) and eventually necrosis.
- **Potassium**: Potassium is vital for various physiological processes in plants. Its deficiency can lead to chlorosis and necrosis, especially in older leaves.
- **Sulphur**: Sulphur is important for protein synthesis and the formation of chlorophyll. However, its deficiency does not typically lead to necrosis.

3. **Conclusion**:
- Among the minerals listed, **sulphur** deficiency does not cause necrosis. Therefore, the answer to the question is **sulphur**.

### Final Answer:
**Sulphur**