Which one of the following elements in plants is not mobilised?

Sulphur

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Phosphorus

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Calcium

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Potassium

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Solution

The correct option is C Calcium
Calcium along with sulphur is most immobile element present in plants. Hence, deficiency symptoms of calcium and sulphur are first seen in young leaves. Calcium is present in the cell wall as calcium pectate, which cannot be readily mobilised. Hence, calcium is an immobile element.

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