Water transport through plants

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  • Water transport in plants
    • Xylem
      • Transport through xylem vessels
      • Composed of dead cells joined to form empty tubes, before cells die they form a thick cell wall containing lignin in rings or helices
        • Lignin makes vessels very strong so they can withstand pressure
      • Usually forms a star shape called stele
    • Roots
      • Epidermis - single layered with root hairs to increase pressure
      • Cortex - Thick layer of packing cells containing stored starch
      • Endodermis - single layer of tightly packed cells, waterproof casparian *****
      • Pericycle - undifferentiated cells
      • Vascular tissue - contains xylem and phloem cells, continuous with stem vascular bundles.


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