2.54 Transpritation

Key points:

1. Transpiration is the evaporation of water from the surface of a plant
2. Heat is needed to carry out the evaporation, and this heat comes from sunlight which is absorbed through the leaf's structure
3. Light energy (High Frequency, UV) converted into heat energy (Low frequency) from the leaf's structure
4. Evaporation is right above the stomatal pores, water is delivered there from the xylem, moves through the spongy layer. 
5. Liquid to gas. Evaporation happens in the area right above the stomatal pore. Not all the light energy is used for photosynthesis so some of it converts into heat energy and heats up the water, causing the average kinetic energy of the atoms in the water to increase, turning it into a gas.