Opening of stomatal aperture is facilitated by

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contraction of outer wall of guard cells

cecrease in turgidity of guard cells

radial orientation of cellulose microfibrils in the cell wall of guard cells

longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

answer is C.

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Detailed Solution

Opening of stomatal aperture is facilitated by radial orientation of cellulose microfibrils in the cell wall of guard cells. When the guard cells lose turgor, due to water loss (or water stress) the elastic inner walls regain their original shape, the guard cells become flaccid and the stoma closes.

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