SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Colour-enhanced Scanning Electron Micrograph (SEM) showing a celery stalk in cross section. A celery (Apium graveolens var. It serves many of the same functions as a stem. The pipes that conduct water and nutrients in a stalk of celery are shown in the micrograph. They contribute to the crunchiness of the stalks. Image width: 320 micrometers. Magnification: 312x if the image is printed 10 cm wide.
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