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Q.

Which of the following facilitates opening of stomatal aperture?

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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

answer is B.

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Detailed Solution

Cellulose microfibrils are oriented radially rather than longitudinally making it easier for stomata to open. Whenever guard cells become turgid, due to radial microfibrils and differential thickening of guard cells, their outer surface bulge out & inner surface become crescent shape.

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