NANOFLIGHT (R) MOVIE, STEFAN DILLER / SCIENCE PHOTO LIBRARY NANOFLIGHT (R) MOVIE, STEFAN DILLER / SCIENCE PHOTO LIBRARY
Tomato stem. Coloured scanning electron micrograph (SEM) of the stem of a tomato plant (Solanum lycopersicum). The surface layer consists of epidermal cells that have thickened outer walls and secrete a waxy coating, or cuticle, which prevents water loss. Gases are exchanged through openings, or stomata, such as the one seen at the start of the clip.
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