Transpiration and Translocation

• What is the structure of phloem tissue?

  Columns of elongated living cells with pores in the walls that connect to allow cell sap to flow
• What does the phloem tissue transport?

  Food substances which are mainly dissolved sugars
• Does the phloem transport nutrients in one or both directions?

  Both directions
• What is the process of transporting nutrients through the phloem?

  Translocation
• What is the structure of xylem tissue?

  Dead cells join end to end with no walls separating them
• What material strengthens the walls of xylem?

  Lignin
• What do the xylem carry?

  Water and mineral ions
• In what direction does the xylem tissue carry water and mineral ions?

  From the roots to the stem and leaves
• What is the name for the process of transporting water and mineral ions from the roots and out through the leaves?

  The transpiration stream
• What is transpiration?

  The loss of water from a plant
• Where does transpiration occur in the plant?

  The leaves
• What two processes make up transpiration?

  Evaporation and diffusion
• What happens as a result of the loss of water through evaporation?

  More water is drawn from the plant through xylem
• Why does water diffuse through the stomata?

  Because there is a higher concentration of water in the leaf than the outside