Which environmental change would cause an increase in the rate of transpiration?

The rate of transpiration is affected by environmental conditions: - **Light intensity:** More light causes stomata to open wider, increasing the rate. So, *decreased* light would *decrease* the rate. - **Wind speed:** Higher wind speed blows away the layer of humid air around the leaf, maintaining a steep concentration gradient for water vapour to diffuse out. So, *decreased* wind speed would *decrease* the rate. - **Humidity:** Humidity is the amount of water vapour in the air. If the air is very humid, the concentration gradient between the inside of the leaf and the outside is low, so diffusion is slow. So, *increased* humidity would *decrease* the rate. - **Temperature:** Higher temperatures give water molecules more kinetic energy, causing them to evaporate more quickly from the surfaces of the cells inside the leaf. This increases the rate of transpiration.