Tobacco leaf, SEM

Tobacco leaf, SEM

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Caption: Tobacco leaf. Coloured scanning electron micrograph (SEM) of the underside of a winged tobacco (Nicotiana alata) leaf, showing trichomes (long) and a stomata (small, oval). Trichomes are tiny hair-like structures that can be glandular, secreting oils or other substances, or structural for defence. Stomata are pores that are the site of gaseous exchange in the plant. The opening and closing of the stomata is controlled by semicircular guard cells (dark). When the guard cells are turgid the stomata are open and when they are flaccid the stomata are closed.

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Keywords: anatomical, anatomy, angiosperm, angiosperms, biological, biology, botanical, botany, cell, cells, close-up, colored, coloured, detail, false-colored, false-coloured, flora, guard cell, hair, hairs, jasmine tobacco, leaf, lower side, nature, nicotiana alata, plant, plants, pore, scanning electron micrograph, scanning electron microscope, sem, single, stoma, stomata, structure, structures, surface structure, tanbaku, trichome, trichomes, underside, wildlife, winged tobacco

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