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| Description: When flaccid, guard cells close stomatal pores. Turgid guard cells produce a stomatal opening. (a) An SEM of a stoma in a rose leaf, showing the two guard cells bordering a partly open pore. (b) Thickened inner cell walls and radial orientation of cellulose microfibrils in the guard cell walls explain why they separate when turgid, forming a pore.
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