Which of the stomatal walls is thick?

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(A) The guard cells of the stomata have a specialized structure to regulate the opening and closing of the pore. The inner walls of the guard cells (t

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Inner

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(A) The guard cells of the stomata have a specialized structure to regulate the opening and closing of the pore. The inner walls of the guard cells (those facing the stomatal pore) are thick and inelastic,while the outer walls (away from the pore) are thin and elastic. This structural difference allows the guard cells to change shape and open the stoma when they become turgid.

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