Closed and open stomata on tobacco leaf

Closed and open stomata on tobacco leaf

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: Scanning electron micrograph of an closed (at left) and open stoma 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. Magnification X2200 (at 10x8 size).

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Keywords: botany, closed, epidermis, leaf, leaf surface, leaves, nature, nicotiana tabacum, open stomata, plant, plants, scanning electron micrograph, sem, stoma

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