Closed stoma, SEM

Closed stoma, SEM

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Closed stoma. Coloured scanning electron micrograph (SEM) of a closed 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. Magnification: X1040 at 10 centimetres wide.

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Keywords: biological, biology, botanical, botany, cells, closed, coloured, epidermis, false-colour, false-coloured, green, guard cell, leaf, nature, nicotiana tabacum, one, photosynthesis, plant, pore, respiration, scanning electron micrograph, scanning electron microscope, sem, shut, single, stoma, surface, tobacco, transpiration

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