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4 marks (−1)

Which of the following facilitates opening of stomatal aperture?

  1. A
    Contraction of outer wall of guard cells
  2. B
    Decrease in turgidity of guard cells
  3. C
    Radial orientation of cellulose microfibrils in the cell wall of guard cells
  4. D
    Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

Solution & Step-by-step Explanation

Stomata open when guard cells become turgid. The radial orientation of cellulose microfibrils in the guard cell walls allows them to bulge outwards more easily, pulling the stomatal pore open.

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Try it yourself before checking the explanation above.

Which of the following facilitates opening of stomatal aperture?
A
Contraction of outer wall of guard cells
B
Decrease in turgidity of guard cells
C
Radial orientation of cellulose microfibrils in the cell wall of guard cells
D
Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

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Plant PhysiologyTransport in Plants

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