Which of the following statements is true about the passive uptake of ions?

Root endodermis has the ability to actively transport ions $A$ because of $B$. Choose the correct pair.

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

Unlike water,all minerals cannot be passively absorbed by the root because the concentration of minerals in the soil is usually ....... than the concentration of minerals in the root.

The transport of ions up the stem to all parts of the plant is through:

Minerals are present in the soil in sufficient amounts. Do plants need to adjust the type of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach the xylem?