Transpiration and Translocation

• Phloem tubes transport food

  • made of columns of living cells with small pores in the end walls to allow cell sap to flow through
  • transport substances made in the leaves to the rest of the plant for immediate use or for storage
  • both directions
  • this process is caused transpiration
• xylem tubes take water up

  • made of dead cells hoined end to end with no end walls between them - strengthened with lignin
  • carry water and mineral ions from the roots to the stem and leaves
  • movement of water from the roots, through the xylem and out of the leaves is called transpiration stream
• transpiration is the loss of water from the plant

  • transpiration is caused by the evaporation and diffusion of water from a plant's surface - happens at leaves
  • evaporation creates a shortage of water in the leaf and so more water is drawn up from the rest of the plant
  • this means more water is drawn up from the roots and theres a constant transpiration stream of water through the plant
• transpiration is the loss of water from the plant

  • transpiration is caused by the evaporation and diffusion of water from a plant's surface - happens at leaves
  • evaporation creates a shortage of water in the leaf and so more water is drawn up from the rest of the plant
  • this means more water is drawn up from the