Stomata, SEM 照片檔

Stomata. Coloured scanning electron micrograph (SEM) of stomata (holes) on the surface of daisy petal. These structures perform a similar function to the pores in human skin, allowing water to pass out of the plant. They also act like lungs, allowing carbon dioxide and oxygen (found in air) to pass into and out of the plant. The stomata can be opened and closed depending on the conditions and the need to retain water. Water and carbon dioxide are combined in photosynthesis to produce sugars (transported around the plant in veins) and oxygen (released via the stoma). Magnification: x400 when printed 10cm wide