2.54 Transpiration

2.54 recall that transpiration is the evaporation of water from the surface of a plant

Water goes from a liquid phase to a gas phase, which requires heat, and that heat is provided by sunlight (Light energy to heat energy).

 As the leaf structure absorbs the light, the liquid turns to gas, and the evaporation is seen through the stomatal pores.

Water is taken up by osmosis through the xylem which travels up the stem and out through the petiole (evaporation through the stomatal pores). Above the stomal pore the phase change occurs (liquid to gas- evaporation)

Gas water vapour diffuses through the stomatal pore, down a steep diffusion gradient to the outside atmosphere

1. Sunlight warms leaf to create heat

2. Phase change of water to gas

3. Diffusion of water vapour