False colour scanning electron micrograph of open 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; when the guard cells are full of water the pore is open; when they lose turgor, the pore closes. Some of the pores here are still growing & are small. Magnification: X 214 at 35mm size. Original is BW print b745/169.
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Creative#:
TOP10174100
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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