Which of the following facilitates opening of stomatal aperture?

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

Decrease in turgidity of guard cells

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

Contraction of outer wall of guard cells

answer is B.

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Detailed Solution

Radial orientation of cellulose microfibrils in the cell wall of guard cells helps in opening of stomata.
(1) Decrease in turgidity of guard cells promotes closure of stomata.
(3) Longitudinal orientation of cellulose fibrils is not seen in guard cells of stomata. It is radial orientation. Longitudinal orientation of cellulose fibrils promotes linear cell elongation, not transverse stretching.
(4) Contraction of outer wall of guard cells promotes closure of stomata.

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