Which factor has little effect on the rate of transpiration?

Question

Quizplus · Accepted Answer

Transpiration is primarily influenced by environmental factors such as air temperature, relative humidity, air movement, and the amount of direct solar radiation, which affect the rate at which water vapor is lost from plant surfaces. Daily fluctuations in atmospheric carbon dioxide concentrations have little direct effect on the rate of transpiration, as this process is more closely related to the opening and closing of stomata for gas exchange rather than the direct impact of carbon dioxide levels on water loss.

Which Factor Has Little Effect on the Rate of Transpiration