Pine needle, light micrograph

Pine needle, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Pine needle. Light micrograph of a transverse section through a leaf (needle) of a pine tree (Pinus sp.). The leaves are needle-like so they present a large surface area for photosynthesis but prevent too much water loss (transpiration). The epidermis (red, top) is made up of thick walled cells covered with a thick layer of cuticle. The mesophyll (pink) under the epidermis is made up of parenchyma cells with in-folded walls to increase the area of chloroplasts for photosynthesis. Magnification: x230 when printed 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cell, cell biology, cells, conifer, coniferous, cut out, cut outs, cut-out, cut-outs, cuticle, cutout, cutouts, cytology, epidermis, flora, gymnosperm, gymnosperms, leaf, light micrograph, light microscope, lm, nature, needle, parenchyma, pine, pinus sp., plant, plant structure, section, sectioned, tree, white background

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