Biology / Unit 11 Bio 2531 short lesson, about 20 seconds
Root Anatomy: Endodermis and Casparian Strip
Captions available
The idea
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.
In practice
The Casparian strip blocks toxins and pathogens from slipping between cells while still admitting water the plant needs.
Where people slip
The root cap protects the growing tip and is replaced continuously — a separate structure from the endodermis inside.
Your place on the trail
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