Necrosis to crops is due to the deficiency of

Options

A. Ca, K,S and Mo
B. N,K,S and Mo
C. N,S,Fe and Zn
D. Mg, S, Mn and Ca

Answer

### Step-by-Step Solution:

1. **Understanding Necrosis**:
- Necrosis refers to the death of plant cells, which can occur due to various factors, including nutrient deficiencies.

2. **Identifying Causes of Necrosis**:
- Necrosis can be caused by pathogens (such as fungi and viruses) or by deficiencies in essential nutrients.

3. **Nutrient Deficiencies Linked to Necrosis**:
- Several nutrients are critical for plant health, and their deficiency can lead to necrosis:
- **Calcium**: Deficiency causes leaf curling and stunted growth, which can eventually lead to necrosis.
- **Potassium**: A lack of potassium can lead to chlorophyll deficiency, causing leaves to turn yellow and eventually leading to necrosis.
- **Magnesium**: Directly causes necrosis in plant tissues.
- **Copper**: While less commonly discussed, copper deficiency can also contribute to necrotic symptoms in plants.

4. **Conclusion**:
- The deficiency of Calcium, Potassium, Copper, and Magnesium can lead to necrosis in crops. Therefore, the answer to the question is that necrosis in crops is due to the deficiency of these nutrients.