cell transport

• hypotonic


  dilute solution- water enters
• hypotonic- animal cell


  mass increased till cell bursts
• hypotonic- plant cell


  mass increases, cell wall supports (turgid)
• isotonic


  same conc - no net movement
• isotonic- animal cell


  mass stays the same
• isotonic- plant cell


  mass stays the same- flacid
• hypertonic


  concentrated solution- water leaves
• hypertonic- animal cell


  mass decreases- cell shrivels
• hypertonic- plant cells


  mass decreases, cell membrane separates form cell wall - plasmolyed
• osmosis practical


  independent: conc of salt solution

  dependent: mass of potato, length of potato(end)

  control: volume of solution, length of potato(start), temp
• osmosis practical steps

  1. prepare samples of potatoes (gently dry to remove excess liquid) and place in different concentrations of sugar chlorine solution(0 mol/dm^3 - 1 mol/dm^3) in test tubes
  2. take measurements of mass and the length of your samples before and after soaking them in solutions
  3. calculate the percentage change mass of plant tissue
  4. plot and draw graph results