To solve the question of identifying the mismatched pair regarding deficiency symptoms, we will analyze each option provided and determine if the symptoms correspond correctly to the listed elements.
### Step-by-Step Solution:
1. **Understanding Necrosis**:
- Necrosis refers to the death of plant tissues.
- It is primarily caused by the deficiency of elements such as Calcium, Magnesium, Copper, and Potassium.
- Since these elements are correctly associated with necrosis, this option is matched correctly.
2. **Analyzing Delay in Flowering**:
- Delay in flowering indicates stunted growth in plants.
- This symptom is typically associated with deficiencies in Nitrogen, Sulfur, and Molybdenum.
- The option lists Calcium, Magnesium, and Potassium, which are not primarily responsible for delaying flowering. Therefore, this is a mismatched pair.
3. **Inhibition of Cell Division**:
- Inhibition of cell division can occur due to deficiencies in Nitrogen, Potassium, Sulfur, and Molybdenum.
- This option is correctly matched as it lists elements that can inhibit cell division.
4. **Understanding Chlorosis**:
- Chlorosis is characterized by the yellowing of leaves due to the loss of chlorophyll.
- It is associated with deficiencies in Nitrogen, Potassium, Magnesium, Sulfur, Iron, Manganese, Zinc, and Molybdenum.
- The option lists Nitrogen, Potassium, Magnesium, and Sulfur, which are indeed related to chlorosis. Thus, this option is also matched correctly.
5. **Conclusion**:
- After analyzing all the options, the second option regarding "Delay in flowering" with the elements Calcium, Magnesium, and Potassium is the mismatched pair.
### Final Answer:
The mismatched pair is: **Delay in flowering - Calcium, Magnesium, and Potassium**.
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