cell models

• Cells


  Can be modelled using cubes
• Investigating the effect of increasing size on surface area to volume ratios

  Using models based on cubes
• As the volume increases

  The surface area does not increase at the same rate
• If a graph is drawn
• Scientists have estimated the surface area : volume ratios of various organisms
• Organisms


  • Bacterium
  • Blow fly
  • Whale
• Large organisms


  • Have mechanisms to increase surface area proportionately, such as additional absorbing areas or adaptations of shape
  • Have transport systems and keep distances to a minimum for diffusion
• Organisms living in harsh environmental conditions


  • May reduce their surface area, eg cacti, to reduce loss of water