EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Carob tree (Ceratonia siliqua) leaf surface, coloured scanning electron micrograph (SEM). The blue/green structures are stomata (leaf pores), the site of gaseous exchange in a plant. The opening and closing of the stomata is controlled by the semi-circular guard cells. When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed. Magnification: x360 when printed at 10 centimetres wide.
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