Schematic Section of a Plant Leaf (IMAGE) Max Planck Institute for Chemical Ecology Caption Electrodes are inserted through stomata (small pores in the leaf surface regulating evaporation and gas exchange; dark green) into the inner leaf tissue. This way, electrical processes can be measured. Credit Drawing: Justus Liebig University, H. Felle Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.