5 key points:
- Transpiration is the evaporation of water from the surface of the plant through the stomatal pores.
- Some light is absorbed by other structures in the leaf which creates heat and water is delivered to the leaf by xylem, and goes through the spongy mesophyll.
- Liquid changes to a gas in the spongy mesophyll
- It then diffuses out to the outside atmosphere at a fairly steep diffusion gradient.
- Heat and light energy changes H2O to water vapor.