MAREK MIS / SCIENCE PHOTO LIBRARY MAREK MIS / SCIENCE PHOTO LIBRARY
Apple stem. Polarised light micrograph of a section through the stem of a young apple (Malus domestica) tree plant showing a vascular bundle (centre). The bundle contains phloem (red) and xylem (yellow and green) cells, which transport carbohydrates and water around the plant respectively. Magnification: x100 when printed 10 centimetres wide.
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