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. Magnification: x720 at 10 centimetres wide.
October 7th, 2018
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