When the guard cells swell due to the entry of water, the stomata gets .................. due to the osmotic potential.

Closed

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Flacid

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Open

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Rigid

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Solution

The correct option is C Open
Opening and closure of the stomatal pore are mediated by changes in the turgor pressure of the two guard cells. The turgor pressure of guard cells is controlled by movements of large quantities of ions and sugars into and out of the guard cells. When guard cells take up these solutes, the water potential inside the cells decreases, causing osmotic water flow into the guard cells. This leads to a turgor pressure increase causing swelling of the guard cells and the stomatal pores open.

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Similar questions

Stoma opens when -

1)guard cell swell due to an increase in their water potential

2)guard cell swell by endosmosis due to influx of proton

3)guard cell swell by endosmosis due to efflux of potassium ion

4)guard cells swell due to a decrease in their water potential

Arrange the events of opening stomata in correct sequence and choose the correct option accordingly.

I. Lowering of osmotic potential of guard cells.

II. Decline in guard cell solvent.

III. Rise of potassium ion level in guard cells.

IV. Guard cells absorb water from neighboring epidermal cells.

V. Guard cells become flaccid.

VI. Guard cells swell and make a pore between them, water is lost

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