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The deficiency of which elements are responsible for causing chlorosis as well as necrosis:

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Calcium and Iron

Potassium and Magnesium

Calcium and Copper

Sulphur and Molybdenum

answer is B.

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Detailed Solution

Chlorosis is the loss of chlorophyll leading to yellowing in leaves. Necrosis is death of tissue, particularly leaf tissue. Chlorosis as well as necrosis can be caused by deficiency of potassium and magnesium.

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