Aspen leaf

Aspen leaf

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Credit: ROD PLANCK/SCIENCE PHOTO LIBRARY

Caption: Aspen leaf. Close-up of a section through a leaf of a bigtooth aspen tree (Populus grandidentata). The veins are seen as a pale network, whilst the main vein (midrib, thick) runs through centre. The vein network carries water (in xylem tissue) and sugar nutrients (in phloem tissue) throughout the leaf. A leaf is the main energy-gathering organ of a green plant. It traps the energy of sunlight by using the pigment chlorophyll as part of a process called photosynthesis. The chlorophyll gives the leaf its green colour. The bigtooth aspen tree is found in north-eastern North America.

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Keywords: american, aspen, bigtooth, botany, chlorophyll, close-up, green, leaf, leaves, midrib, nature, north america, phloem, photosynthesis, plant, plants, populus grandidentata, section, sectioned, sugar-transport, tree, vein, veins, venation, water-transport, xylem

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