Sunflower leaf, light micrograph

Sunflower leaf, light micrograph

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Credit: DR KEITH WHEELER/SCIENCE PHOTO LIBRARY

Caption: Sunflower leaf. Light micrograph of a transverse section through the midrib of a sunflower (Helianthus annuus) leaf. The upper and lower epidermis on the surfaces of the leaf are blue. Under the upper epidermis are palisade cells (yellow), which contain chloroplasts, the site of photosynthesis. Within the midrib is a ring of vascular bundles, composed of xylem (red) and phloem (dark blue) cells, which transport water and carbohydrates around the plant respectively. Magnification: x100 when printed at 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cells, chloroplasts, choroplast, cross section, cross-section, epidermis, flora, helianthus annuus, leaf, light micrograph, light microscope, mesophyte, midrib, nature, palisade cell, phloem, plant, plant anatomy, sectioned, sunflower, transverse section, vascular bundle, white background, xylem

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