Closed stomatal pore on broad bean leaf

Closed stomatal pore on broad bean leaf

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Caption: Closed stomatal pore. Light micrograph of an closed stomatal pore on the surface of a broad bean (Vicia Faba) leaf. The stomatal pore is closed by two kidney shaped guard cells (at centre). Guard cells open and close the stomata depending on light, temperature and the internal water supply of the leaf. Open stomata allow gases to be exchanged by leaf tissues during photosynthesis. When closed, stomata can prevent water loss during dry periods. The broad bean, also called horsebean or Windsor bean, has been cultivated as food since prehistoric times and is still the most common bean in many parts of Europe. Magnification: x640 at 35mm size.

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Keywords: bean, botany, broad bean, guard cell, iris, leaf, leaf surface, leaves, light micrograph, nature, plant, plants, stoma, stomata

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