Which cells in a root form a protective barrier to the vascular system where all materials must move through the symplast?

Question

Quizplus · Accepted Answer

The endodermis forms the innermost layer of the cortex and has a distinctive band of suberized cells called the Casparian strip that creates a barrier to the apoplastic movement between cells. Materials must move through the symplast of the endodermis, including water and nutrients, before entering the vascular system. The cortex, pericycle, and epidermis do not form a similar protective barrier. The exodermis is a specialized layer found in some roots that provides additional protection but is not directly involved in regulating the movement of materials into the vascular system.

Which Cells in a Root Form a Protective Barrier to the Vascular