transpiration

• what is transpiration?

  transpiration is the loss of water vapor from plant leaves by evaporation of water at the surfaces of mesophyll cells followed by diffusion of water vapor through he stamata.
• what are the transpirtation factors?

  1. air movement- more means there is good flow which removes water vapour form the air surrounding the leaf which sgets up a concentration graident bettween the leaf and the air increasing water loss
  2. light interinsty- more means gurards cells are responsive to light intensity when it is high they are turgid and the stomata starts to open alowing water to be lossed.
• what is the hole in a pair of a pair of guard cells called?

  stomata
• what do flacid guards cells mean?


  when it's flacid water as evaported and it is flat. it means the stomato is closed
• when guard cells are turgid what does it mean?


  when the stomata gap is turgid the guard cells are full of water. this means the stomata is open.
• Humidity- factor affecting transpiration


  Humidity decreases transpiration rate. this is because it reduces the concentration of water molecules outside the leaf; diffusion of water from the leaf increases.
• Temperature- affect on transpiration


  Temperature- causes an increase in rate of transpiration. This is because it Increases molecular movement so that: more water molecules evaporate from cell surfaces; the rate of diffusion of water molecules from the leaf is increased.