JAMES BELL / SCIENCE PHOTO LIBRARY JAMES BELL / SCIENCE PHOTO LIBRARY
Light micrograph of the surface of a leaf of a sugar maple tree, Acer saccarum, showing the network of sap-conducting veins (pale) and the numerous dark green cells, packed with chloroplasts, where photosynthesis occurs. The veins are responsible both for supplying the leaf cells with sap from the roots and for carrying away the products of photosynthesis for distribution to the rest of the tree. Magnification: x100 at 35mm size.
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