Leaf stoma section, TEM

Leaf stoma section, TEM

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Caption: Leaf stoma. Coloured transmission electron micrograph (TEM) of a section through the two guard cells surrounding a stoma on a plant's leaf. Stomata are pores on a leaf's surface that regulate gaseous exchange between the interior of the leaf and the atmosphere and also control the rate of water loss from the leaf. They do this by opening or closing depending on the atmospheric conditions. The opening and closing is achieved by the guard cells swelling or becoming flaccid. As photosynthesis is dependent on light and a supply of carbon dioxide, stomata are generally open in the day to admit the gas. In the day, however, water is readily lost through the stomata, and must be replaced from the ground. Stomata typically close at night and during drought to prevent water loss. Magnification: x10,000 when printed 10cm wide.

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Keywords: biological, biology, botanical, botany, cells, coloured, duo, false-coloured, gas, gaseous exchange, guard cell, leaf, leaves, nature, pair, plant, plant anatomy, pore, stoma, stomata, tem, transmission electron micrograph, transmission electron microscope, transpiration, two

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