DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Black pepper stem. Polarised light micrograph of a transverse section through the stem of a black pepper (Pipa nigrum) plant. This plant had two groups of vascular bundles; one in the central pith and one in an outer ring. Within the vascular bundles are xylem (green) and phloem (blue) cells, which transport water and carbohydrates around the plant respectively. This structure gives this twining stem strength and flexibility. Magnification: x14 when printed at 10 centimetres wide.
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