SEM of spruce needle stomata

SEM of spruce needle stomata

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Caption: Spruce needle stomata. Coloured scanning electron micrograph (SEM) of two stomata (pores) on the surface of a needle of a sitka spruce (Picea sitchensis). The stomata are in sunken pits. Each stoma can be opened and closed by the two guard cells (light green) on either side of it. This allows the exchange of gases between the plant and the air to be controlled. The sunken stomata and the layer of wax (pale green) covering the surface of the needle minimise water loss from the tree. This conifer is native to North America, being most common in the north-west. Magnification: x670 at 6x7cm size.

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Keywords: biology, botany, conifer, evaporation, green, guard cells, leaf, leaves, nature, needle, picea sitchensis, plant, plants, scanning electron micrograph, sem, sitka spruce, stomata, tree, water loss prevention, wax

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