Plant Transport

• Materials needed for plants

  Water, carbon dioxide, minerals, glucose
• Metabolic processes in plants

  Photosynthesis, respiration, growth, reproduction
• Osmosis


  The movement of water molecules from an area of high concentration to an area of lower concentration through a semi-permeable membrane.
• How are root hairs adapted for osmosis?

  They have thin walls.

  They have a large surface area.

  They have no cuticles.
• Where does water enter via osmosis before diffusing to the xylem


  Root cortex
• What are the four main processes that aid in the upward movement of water?

  Root pressure

  Adhesion

  Cohesion

  Transpiration
• What is adhesion?


  Different molecules sticking to each other
• What is cohesion?


  Similar molecules sticking to each other
• What is trnspiration?


  This is the upward movement of water through a plant, with the eventual evaporation of water vapour through the stomata on the underside of leaves.
• Who proposed the cohesion-tension model?

  Dixon and Joly
• Describe the events of the movement of water upwards

  Root pressure arises in the root and pushes water through the xylem

  The cohesion and adhesion of water molecules in the narrow xylem causes the water to flow in a continuous column