Water

• What absorbs water? How?

  Root hair cells by osmosis
• How did root hair cells adapt ?

  Large surface area
• Water use :

  • Photosynthesis
  • Cooling leaves ( evaporation )
• Ways to prevent water loss :

  • Stomata found at bottom of leaf
  • Open + close - control entry + exit of CO2 and H2O
• What happens to the stomata during the day?

  • Open
  • Allow CO2 to diffuse in for photosynthesis
  • Water Vapor diffuses out
  • Guard cells open - fill with water - turgid
• What happens to stomata during the night?

  • Close
  • Close to prevent water loss
  • Guard cells close - water leaves - becomes flaccid
• What are guard cells controlled by?

  Water and light