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What controls the opening and closing of stomata?

Answer and explanation

Correct answer: Guard cells

Each stoma is surrounded by a pair of specialized guard cells. Changes in their water content alter turgor pressure: when they become turgid, the pore generally opens, and when they lose water, it closes. This regulates carbon dioxide entry and reduces excessive water loss. Root, blood and nerve cells do not directly control stomatal movement. Hence option A is correct.

Related tags

Guard CellsStomataPlant RegulationLife ProcessesWorld Of LivingScienceClass 10 Mcq

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