Osmosis

• Osmosis


  The NET movement of water across a partially permeable membrane from an area of higher water concentration to an area of lower water concentration
• Isotonic


  Two solutions that have the same water concentration
• Cells placed in:


  • Pure water burst
  • concentrated sugar solution shrink/becomes flaccid
  • Isotonic solution stay the same
• Plant cell in pure water


  • Swell
• Plant cells do not burst when placed in pure water because the cell wall is strong enough to stop it bursting
• Flaccid / Plasmolysed


  A cell in which the cytoplasm shrinks away from the cell wall completely
• Plant cell placed in:

  • Equal sugar concentration to cell cytoplasm start to pull from cell wall
  • Weaker sugar solution than cell cytoplasm shrivels
  • Stronger sugar solution than cell cytoplasm swells
• Plants without woody tissue wilt if they are not given enough water because the stem cells go flaccid