CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY
Light micrograph of a wilted tulip petal. In the cells of a fresh petal the cytoplasm (stained red) fills each of the cells, but as the petal begins to wilt, water is lost and the cytoplasm retracts into the centre of each cell, as seen here. Magnification: x150 at 35mm size.
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