Brown heart of heart rot disease is due to deficiency of

Iron

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Boron

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Potassium

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Molybdenum

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Solution

The correct option is B Boron
Boron is a micronutrient required in small amount by the plant. It is necessary for membrane functioning, cell elongation and cell differentiation. It's deficiency results in heart rot disease in a plant which can cause structural weakness and can lead to broken trunk and branches.
So the correct answer is 'Boron'.

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