What is the physical barrier in the root that regulates the flow of water to xylem via cell walls?

Name: What is the physical barrier in the root that regulates the flow of water to xylem via cell walls?
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Quizplus · Accepted Answer

The Casparian strip is a band of cell wall material that is impervious to water and dissolved substances. It is present in the endodermis layer of the root and regulates the flow of water and nutrients to the xylem. The epidermis, cortex, and phloem do not have this specific function.

What Is the Physical Barrier in the Root That Regulates