DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Buttercup root. Light micrograph of a transverse section through the root of a buttercup (Ranunculus sp.) plant. At centre is the vascular bundle, comprising xylem (red) and phloem (pink) tissues, which transport water and carbohydrates around the plant respectively. The majority of the root is taken up by the cortex, consisting of parenchyma cells containing starch grains (brown) a store of energy. Magnification: x45 when printed at 10 centimetres wide.
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