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Grey spots of oat are caused by deficiency of Manganese.

1. Iron
2. Manganese
3. Zinc
4. Copper

Correct answer: Manganese

Solution

Grey spots or grey speck of oat are a well-known symptom of manganese deficiency. Manganese is essential for chlorophyll formation and enzyme activity, so its lack produces characteristic speckling and chlorosis in oats.

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