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 (blue) 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 (blue) and air cavities where cells have broken down. Magnification: x14 when printed at 10 centimetres wide.
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