Into what do mineral ions enter from the cell walls of the root?

Some statements are given regarding active transport in plants. Choose the incorrect statement.

Minerals absorbed by the roots travel up the xylem. How do they reach the parts where they are needed most? Do all the parts of the plant get the same amount of the minerals?

Transport proteins of ............. cells are control points,where a plant adjusts the quantity and types of solutes that reach the xylem.

$A -$ $A$ plant adjusts the quality and types of solutes that reach the xylem.
$R -$ Transport proteins of endodermal cells are control points.

The type and quantity of mineral elements in the $xylem$ are maintained by which of the following?