Transportation methods

• Diffusion


  The spreading of particles of a gas or substance from an area of high concentration to an area of low concentration
• Diffusion


  • Can take place in air
  • Can take place in solution
  • Can take place in cell membrane
• Factors that affect the rate of Diffusion

  • Temperature
  • Concentration gradient
  • Surface area of membrane
• Osmosis


  The movement of water from a dilute solution to a more concentrated solution through a partially permeable membrane
• Factors that affect the rate of Osmosis

  • Temperature
  • Concentration gradient
• Active transport


  An active process where substances are moved against their concentration gradient. Energy is required, usually from respiration.
• Active transport


  • Protein carriers carry specific molecules through the membrane
  • In root hair cells, substances are moved against their concentration gradient
• Diffusion


  Passive process
• Osmosis


  Passive process
• Active transport


  Active process
• Diffusion doesn't require energy, moves from high to low concentration
• Osmosis is the movement of water only, from low to high concentration
• Active transport moves substances from low to high concentration, requires energy