Calcium is the element in plants which is not mobilised. This is because it is a structural component and hence needs to be localised. Phosphorus, Sulphur and Potassium are not structural elements and hence can be remobilised based on their need. Thus the element in plants is not remobilised is calcium.

Which mineral is not Remobilised?

Explanation: Calcium is not remonilized from the leaves to the fruits, like potassium, phosphorus and sulphur. It occurs abundantly in a non-exchangeable form such as anorthite (CaAl₂Si₂O₈).

Which of the following mineral is easily remobilized in plants?

Elements which are easily remobilised in plants are phosphorus, sulphur, nitrogen and potassium.