DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Kidney bean. Light micrograph of a transverse section through the fruit pod of the kidney bean (Phaseolus vulgaris), showing a seed (red). The fruit wall (pericarp) is made of three layers: an outer exocarp; a middle mesocarp (pink); and an inner thick layer endocarp (dark-blue). The seed is attached to the fruit wall by a stalk (funicle), at the bottom. The seed coat (testa, black-blue) surrounds the two cotyledons (dark red), of the embryo. Magnification: x11 when printed at 10 centimetres wide.
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