Question

why does transport of ions occur only in one direction in root endodermal cells

Answer 1

As various ions from the soil are actively transported into the vascular tissues of the roots, water follows (its potential gradient) and increases the pressure inside the xylem. This positive pressure is called root pressure, and can be responsible for pushing up water to small heights in the stem. Root pressure can, at. best, only provide a modest push in the overall process of water transport. They obviously do not play a major role in water movement up tall trees. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecules in the xylem which often break under the enormous tensions created by transpiration.

Answer 2

Answer:

transport proteins of endodermal cells are control points where a plant adjust the quantity and types of solutes that reach the xylem.

root endodermis is able to actively transport ions in one direction only bcoz of the layer of actin, lignin, suberin and cellulose

hope it will help you