Transport in plants (b.23)

• define the term osmosis

  movement of water from a dilute solution to a concentrated solution through a semi permeable membrane
• how do you calculate rate of water uptake by a plant?

  volume of water absorbed "divide by" time taken
• how do you calculate percentage change in mass following osmosis?


  change in mass/initial mass x 100
• when looking at an osmosis graph (change in mass of unknown substance vs concentration of known source solution) how can you identify the concentration path unknown substance?


  When the line of best fit crosses the X axis
• which piece of equipment is used to cut a cylindrical piece of potato?

  A cork borer
• which substance moves into a plant by osmosis ?

  Water
• how are root hair cells adapted for osmosis?

  Large surface area and large vacuole
• define active transport

  movement of substances from a dilute to a concentrated solution against the concentration gradient. Requires energy
• name a substance that is moved into plants by active transport

  mineral ions
• how are root hair cells adapted for active transport ?

  lots of mitochondria for respiration
• define diffusion

  movement of particles from an area of high concentration to an area of low concentration
• name one substance that moves into a leaf by diffusion

  carbon dioxide
• name two substance that moves out of a leaf by diffusion


  oxygen and water
• which cells open and close to control the diffusion of substance from a leaf?

  guard cells
• Name the process by which glucose is moved from a leaf to other parts of the cell

  Translocation