Open stoma, SEM

Open stoma, SEM

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Caption: Open stoma. Coloured scanning electron micrograph (SEM) of an open stoma on the surface of a tobacco leaf (Nicotiana tabacum). Stomata are pores found on the leaf surface that regulate the exchange of gases between the leaf's interior and the atmosphere. Stomatal closure is a natural response to darkness or drought as a means of conserving water. Each pore is controlled by two guard cells (red); the pores open when they are full of water and close when they lose water. On the left is a closed stoma. Magnification: x880 at 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cells, closed, coloured, duo, epidermis, false-colour, false-coloured, green, guard cell, images, leaf, magnified image, microscopic photos, nature, nicotiana tabacum, open, opening, openings, pair, photosynthesis, plant, pore, pores, respiration, scanning electron micrograph, scanning electron microscope, sem, shut, stoma, stomata, subjects, surface, tobacco, transpiration, two

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