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The toxicity symptoms of Mn like brown s...

The toxicity symptoms of Mn like brown spots surrounded by chlorotic veins is due to -

A

Deficiency of Mn only

B

Excess of Fe

C

Excess of Mg

D

Combined deficiency symptoms of Fe, Mg and Ca

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Manganese (Mn) Toxicity:** - Manganese is a micronutrient essential for plant growth but can be toxic when present in excessive amounts. 2. **Identifying Symptoms of Manganese Toxicity:** - The specific symptom mentioned in the question is the appearance of brown spots surrounded by chlorotic (yellowing) veins on the leaves. This symptom is characteristic of manganese toxicity. 3. **Analyzing the Options:** - **Option 1: Deficiency of manganese only** - This would not cause toxicity symptoms; rather, it would lead to deficiency symptoms. - **Option 2: Excess of iron** - While iron is also a micronutrient, its excess does not typically lead to the symptoms described. - **Option 3: Excess of magnesium** - Similar to iron, excess magnesium does not cause the specific symptoms of manganese toxicity. - **Option 4: Combined deficiency symptoms of iron, magnesium, and calcium** - This option refers to deficiencies, not toxicities. 4. **Conclusion:** - The symptoms of brown spots surrounded by chlorotic veins are indicative of manganese toxicity due to the excess of manganese in the plant. Therefore, the correct answer is that these symptoms are due to manganese toxicity. **Final Answer:** The toxicity symptoms of Mn, like brown spots surrounded by chlorotic veins, are due to excess manganese. ---
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