B2__Organsiation

Xylem

  • Found in plant stem
  • Form long tubes to carry water dissolve minerals from roots to leaves
  • Very thick walls containing lignin to support plant, causes xylem cells to die
  • End walls between cells broken to form a tube
  • No nucleus, cytoplasm, vacuole chloroplasts

Phloem

  • Carry dissolved sugars up and down plant
  • Consists of phloem vessel cells, no nucleus with limited cytoplasm. And the end walls of these have pores called sieve plates, these feature allow dissolved sugars to move through
  • Each vessel cell has a companion cell with lots of mitochondria for energy for Active Transport