2.55 explain how the rate of transpiration is affected by changes in humidity, wind speed, temperature and light intensity

Humidity
- The drier the air around the leaf, the faster transpiration happens
- If the air around the leaf is humid then there's lots of water in it already so theres not much diffusion taking place as there isn't a massive concentration difference

Wind speed
- The higher the windspeed, the greater the transpiration
- If windspeed around the leaf is slow, water vapour will not move away from the leaf. This means there is a high concentration of water particles inside and outside the leaf so diffusion is very slow.
- If it is windy  the water vapour surrounding the leaf its swept away, meaning a low concentration of water outside the leaf. Diffusion will happen quickly, as there is an area of low concentration (outside) and an area of high concentration (inside the leaf).

Temperature
- The warmer it is, the faster transpiration happens. This is because, when it is warmer, the water particles have more energy to evaporate and diffuse out of the stomata

Light intensity
- The brighter the light, the greater the transpiration rate. This is because stomata close when it is dark (as photosynthesis can't occur, so there is no need to let in CO2). When stomata are closed, very little transpiration can occur.