Which one of the following symptoms is not due to manganese toxicity in plants?

Options

A. Calcium translocation in shoot apex is inhibited
B. Deficiency of both Iron and Nitrogen is induced
C. Appearance of brown spot surrounded by chlorotic veins
D. None of the above

Explanation

To determine which symptom is not due to manganese toxicity in plants, we need to analyze the options provided in relation to manganese's role and effects in plants.

### Step-by-Step Solution:

1. **Understanding Manganese's Role**:
- Manganese is a micronutrient essential for plant growth. It plays a crucial role in photosynthesis, respiration, and nitrogen assimilation.

2. **Identifying Symptoms of Manganese Toxicity**:
- Manganese toxicity can lead to several symptoms, including:
- **Chlorosis**: Yellowing of leaves, particularly in young leaves.
- **Necrotic Spots**: Dark spots on leaves due to cell death.
- **Inhibition of Growth**: Overall stunted growth of the plant.

3. **Analyzing the Options**:
- **Option A**: Calcium translocation and shoot apex is inhibited.
- This symptom is related to calcium deficiency, not manganese toxicity.
- **Option B**: Deficiency of both iron and nitrogen is induced.
- This is not a symptom of manganese toxicity; rather, it indicates a different nutrient deficiency.
- **Option C**: Appearance of brown spots surrounded by chlorotic veins.
- This is a symptom of manganese toxicity as it relates to necrosis and chlorosis.
- **Option D**: None of the above.
- This option is generally not applicable as we are looking for a specific symptom.

4. **Conclusion**:
- The symptom that is **not due to manganese toxicity** is **Option B**: "Deficiency of both iron and nitrogen is induced."

### Final Answer:
**Option B: Deficiency of both iron and nitrogen is induced.**

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