Structures represented in the illustration below are found in the lower epidermis of a plant leaf. The illustration shows the response to a certain environmental condition. What are the structures that point T and Q and what would the response represented in the illustration most likely be caused by?

I think it's the third one: Letter Q points to the guard cell. Letter T points to the stomata and the response is most likely due to the humid tropical nature of the enviorment.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.