Biology / Bio 2531 · Atom · ~20 seconds
Root Anatomy: Endodermis and Casparian Strip
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A root's endodermis, sealed by a waxy Casparian strip, forces water and solutes through cell membranes rather than between cells, screening entry into vascular tissue.
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The Casparian strip blocks toxins and pathogens from slipping between cells while still admitting water the plant needs.
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The root cap protects the growing tip and is replaced continuously — a separate structure from the endodermis inside.