How do light, wind, and mist affect the gradient of water potential from stem to leaf in a plant?

Question

it has to do with AP Bio lab 9, but its not the actual analyis question, this is a question for my understanding.

thanks! :]

Answer 1

Transpiration regulates how much water moves through the plant.  In hot dry air, more water will evaporate out of the stomates resulting in a higher transpiration rate.  Light, or temperature, can therefore increase transpiration.  Wind will evaporate more water from the leaf's boundary layer (the air surrounding the leaf).  This results in a higher transpiration rate.  Humidity or moisture will lower transpiration because less water will evaporate out of the stomates  because of a low vapor pressure deficient, or basically water won't evaporation as fast if the leaf is wet.  Hope that helps.