2.55 Rate of Transpiration

1. Transpiration is the loss of water through the leaf. It is caused by the heat from the sun. The water turns into gas and diffuses through the stamatal pores as water vapour.
2. If there's a big difference between concentration gradient for water vapour inside the stomatal pore and outside of it, this makes the rate of transpiration faster whereas if there's a small difference, the rate of transpiration will become slower.
3. Low humidity, high temperature, which would cause more evaporation, high light intensity, which would cause more photosynthesis along with heat, and high winds which would blow away the water vapour, on the outside of the plant would mean a big difference, resulting in fast diffusion.
4. However, if the opposite conditions on the outside, would mean a small difference, resulting in slow diffusion.