Hi,

My textbook says that transpiration rate in plants is highest during the day, compared to the night. Is this simply because during the day the sun provides the energy to cause evaporation of water from the cell walls of mesophyll cells, maintaining the water potential gradient for transpiration to occur (but at night, however, this is not the case)?

Thank you!

see
http://www.cropsreview.com/factors-affe … ation.html