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 a protective barrier around the vascular system of the root, known as the Casparian strip. This forces all materials to move through the symplast (cytoplasmic continuum) before reaching the stele, thus providing a selective route for water and nutrient uptake. The pericycle is responsible for lateral root initiation, the cortex is responsible for storage and support, the epidermis provides protection and controls water uptake, and the exodermis is the outermost layer of some roots that functions as a barrier against external stresses.

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