Solution:

Yes, the type and quantity of solutes that reach the xylem must be adjusted by plants. End dermal cell transport proteins aid in the maintenance and adjustment of solute transportation. Mineral ions are regularly remobilized, especially in older sections that are senescing. Much of the mineral content of older dying leaves are exported to younger leaves. Minerals are also transferred to different sections of deciduous plants before leaf fall. Phosphorus, sulfur, nitrogen, and potassium are the elements that are most easily mobilized. Calcium, for example, is not remobilized because it is a structural component.