KCET 2017 Biology Solved Paper

→ The deficiency symptoms of potassium first appear in older leaves, which characteristically develop mottling or chlorosis, followed by necrotic lesions (spots of dead tissue) at the leaf margins.
→ The first and most pronounced symptom of magnesium deficiency is chlorosis due to a breakdown of chlorophyll in the lamina of the leaf that lie between the veins. It is followed by necrosis.