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What are the small openings on the underside of leaves called?

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On the underside of leaves and elsewhere, depending on the plant, are tiny openings called stomata — thousands of them per leaf with variations by plant species. Like little castle gates, pairs of cells on the sides of the stomatal pore — known as guard cells — open their central pore to take in the carbon dioxide

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The small openings on the underside of leaves are called stomata. They are responsible for gas exchange in plants, allowing them to take in carbon dioxide and release oxygen during photosynthesis.

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