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Please help! Which of the following facilitates opening of stomatal aperture?

Which of the following facilitates opening of stomatal aperture?

  • Option 1)

    Contraction of outer wall of guard cells

  • Option 2)

    Decrease in turgidity of guard cells

  • Option 3)

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

  • Option 4)

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

 
Answers (1)
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As discussed in

Opening and closing of stomata -

This is governed by the change in osmotic pressure or turgidity of guard cells.

- wherein

When guard cells are turgid, stomata open and when guard cells are flaccid, stomata close.

 

 

Increase in the turgidity of guard cells, which is due to radial orientation of cellulose microfibrils in the cell wall.


Option 1)

Contraction of outer wall of guard cells

This option is incorrect.

Option 2)

Decrease in turgidity of guard cells

This option is incorrect.

Option 3)

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

This option is correct.

Option 4)

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

This option is incorrect.

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