Xylem vessels

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  • In flowering plants, the vast majority of water is transported through hollow, thick-walled tubes called xylem vessels
  • The main force that pulls water through the xylem vessels in the stem of a plant is the evaporation of water from leaves - a process called transpiration
  • Transpiration - The process where plants absorb water through the roots, which then moves up through the plant and is released into the atmosphere as water vapour through pores in the leaves
  • The energy for transpiration is supplied by the sun and the process is therefore passive