2.55 rate of transpiration

Inside the plant--> region A
Outside the plant--> Region B

Concentration gradient of H2O (between A and B)
--Big difference=high diffusion rate
--small difference=low diffusion rate

Factors causing large difference:
-Low humidity=less water in the air (B)
-High winds=water blown away      (B)
-High temp=high evaporation          (B)
-High light intensity=high rate of photosynthesis and water movement (B)

Factors causing small difference:
-High humidity
-Low wind speed=water concentrates around stomata pore
-low temp=less evaporation
-low water movement, low rate of photosynthesis