A minute epidermal pore in a leaf or stem through which gases and water vapor can pass.
1These little mouths, which are called stomates (a, Fig.
2Second, oil can kill indirectly if it coats the plants' leaves enough to clog small openings called stomates.
3Plants won't need to open their stomates as long to take in CO2, and hence they will pump out less water vapor.
4Evapotranspiration happens when plants open up the tiny pores on their leaves, called stomates, to take in CO2 from the atmosphere for photosynthesis.
5This costs the plant water; for every molecule of CO2 that enters the plant, around 180 molecules of water diffuse out of the stomates.