Plant cells

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  • PLANT CELLS
    • XYLEM
      • Long thick walls impregnated with LIGNIN
        • waterproofs cells
          • cells die
            • end walls and content break down
              • long column of hollow, dead cells
        • Strengthens walls and prevents vessel collapsing
        • Thickening of Lignin forms patters
          • Prevents vessel becoming too rigid
          • allows stem/branch to be flexible
        • Sometimes not complete
          • bordered pits left
            • allows water to pass through
    • SIEVE TUBE ELEMENTS
      • not true cells
        • no nucleus, little cytoplasm
      • Lined up end to end to form a tube for sugars to be transported
      • Sieve plates
        • cross-walls that are perforated
      • Very thing walls
    • COMPANION CELLS
      • between sieve tubes
      • many mitochondria
        • to produce ATP for active transport
          • Use ATP to load sucrose into phloem
      • Plasmodesmata between cells and sieve tubes
        • Untitled

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