Open stomata, SEM

Open stomata, SEM

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Caption: Open stomata. Coloured scanning electron micrograph (SEM) of open stomata 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. Some of the pores are still growing (upper right and lower left). Magnification: X440 at 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cells, coloured, epidermis, false-colour, false-coloured, green, guard cell, leaf, many, multiple, nature, nicotiana tabacum, open, opening, openings, photosynthesis, plant, pore, pores, respiration, scanning electron micrograph, scanning electron microscope, sem, stoma, stomata, surface, tobacco, transpiration

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