Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of

Answer

**Step-by-Step Solution:**

1. **Understanding Necrosis**: Necrosis refers to the death of tissue, particularly in plants, which can affect various parts including leaves. It is important to identify which mineral deficiency leads to this condition.

2. **Analyzing the Options**:
- **Option 1**: Nitrogen (N), Potassium (K), Magnesium (Mg), and Iron (Fe).
- These elements are primarily associated with chlorosis (yellowing of leaves) rather than necrosis. Therefore, this option does not cause necrosis.

- **Option 2**: Manganese (Mn), Zinc (Zn), and Molybdenum (Mo).
- Manganese can cause necrotic spots, but typically not in the leaf tissue as a whole. Zinc is linked to rosette disease, and molybdenum causes yellow spot disease. Hence, this option is also not correct for necrosis.

- **Option 3**: Calcium (Ca), Magnesium (Mg), Copper (Cu), and Potassium (K).
- Calcium is crucial for cell wall stability and its deficiency can lead to necrosis, particularly in leaf tissues. Magnesium is important for chlorophyll production, and its deficiency can also lead to necrosis. Copper and Potassium play roles in various physiological processes, and their deficiency can contribute to tissue death. This option is the most relevant to necrosis.

3. **Conclusion**: The correct answer is the last option, which includes Calcium, Magnesium, Copper, and Potassium, as these elements are associated with necrosis or death of leaf tissue.

**Final Answer**: Necrosis, or death of tissue particularly leaf tissue, is due to the deficiency of Calcium (Ca), Magnesium (Mg), Copper (Cu), and Potassium (K).

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