Some elements like calcium are not remobilised because they are
a)	Structural component	b)	Heavy metals	c)	Less charged	d)	Macromolecules

(a)

Mineral ions are frequently remobilised, particularly from older, senescing parts. Older dying leaves export much of their mineral content to younger leaves. Similarly, before leaf fall in decidous plants, minerals are removed to other parts. Elements most readily mobilised are phosphorus, sulphur, nitrogen and potassium. Some elements that are structural components, like calcium are not remobilised