Necrosis in crops is due to the deficiency of

Options

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

Answer

To determine the cause of necrosis in crops, we need to analyze the elements that are essential for plant health and how their deficiencies can lead to tissue death.

### Step-by-Step Solution:

1. **Understanding Necrosis**:
- Necrosis refers to the death of plant tissue, particularly leaf tissue. It is important to identify which nutrient deficiencies can lead to this condition.

2. **Identifying Essential Nutrients**:
- Plants require various nutrients for their growth and development. Some of these nutrients are classified as macronutrients (needed in larger quantities) and micronutrients (needed in smaller quantities).

3. **Recognizing Nutrient Deficiencies**:
- The transcript mentions that necrosis can be caused by deficiencies in specific nutrients. The key nutrients mentioned are:
- Calcium (Ca)
- Magnesium (Mg)
- Potassium (K)
- Copper (Cu)

4. **Linking Nutrient Deficiencies to Symptoms**:
- Each of these nutrients plays a critical role in plant health:
- **Calcium**: Important for cell wall structure and stability; deficiency can lead to tissue death.
- **Magnesium**: Central to chlorophyll production; its deficiency can cause leaf chlorosis and necrosis.
- **Potassium**: Vital for water regulation and enzyme activation; deficiency can lead to weak plant structure and necrosis.
- **Copper**: Involved in photosynthesis and respiration; its deficiency can also lead to necrosis.

5. **Conclusion**:
- Based on the information provided, necrosis in crops is primarily due to the deficiency of calcium, magnesium, potassium, and copper.

### Final Answer:
Necrosis in crops is due to the deficiency of calcium, magnesium, potassium, and copper.