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Which of the following facilitates opening of stomatal aperture ?

(a) Decrease in turgidity of guard cells

(b) Radial orientation of cellulose microfibrils in the cell wall of guard cells

(c) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

(d) Contraction of outer wall of guard cells

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Ans: (b) Radial orientation of cellulose microfibrils in the cell wall of guard cells

Explanation :

The radial orientation of cellulose microfibrils help in opening stomatal aperture. The stomatal aperture opens when guard cells become turgid and the curvature of the cells increase opening the stomatal aperture

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