Xylem and Phloem

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  • Created by: wilby99
  • Created on: 18-04-16 16:37

Why do plants need transport systems?

  • Because a lot of multicellular organisms like plants hve a high surface area:volume ratio simple diffusion would be too slow a proccess to use to get all the necissary nutrients to relevant parts of the plant.

XYLEM

  • transpot water and mineral ions
  • move from roots to leaves
  • very long and tube-like
  • joined end to end without end walls to interupt the flow of water
  • cells are dead thus containing no cytoplasm
  • cell WALLS are impregnated with lignin
  • lignin is either deposited in spirals or complete rings which allows flexibility and stops the stem from breaking
  • as the cell gets older the ammount of lignin increases
  • there are pits in the cell wall where there is no lignin present…

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