F col SEM of closed stomata on tobacco leaf

F col SEM of closed stomata on tobacco leaf

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Caption: False colour scanning electron micrograph of closed stomata on the surface of a tobacco leaf Nicotiana tabacum. Stomata are breathing pores scattered over the leaf surface, & sometimes stem, that regulate the exchange of gases between the leaf's interior & the atmosphere. Stomatal closure is a natural response to darkness or drought as a means of conserving water. Each pore is controlled by the turgor of two guard cells on either side of it; when they are full of water the pore is open; when they lose turgor, the pore closes. The pores here are at different stages of growth; a central mature one with younger ones round it (knobs). Magnification: X 157 at 35mm. Original is BW print b745/175.

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Keywords: botany, closed, closed stoma, epidermis, leaf, leaf surface, leaves, nature, nicotiana tabacum, plant, plants, stoma

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