Stoma closed — Free Biology Illustration

Biology

Stoma closed

Top-down plant stomatal apparatus in the closed state on the leaf epidermis, showing two flaccid or less-swollen kidney-shaped green guard cells pressed together at the center. The guard cells are less bowed than in the open state, with slightly thickened inner walls and distinct outlines, forming a compact oval structure. The central stomatal pore is absent or reduced to a very thin dark hairline slit or nearly sealed seam with tapered ends between the cells. Small chloroplast dots may be visible inside the guard cells, and the stoma can be set against a pale background of angular epidermal cells.

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