"Select the correct events leading to the opening of stomata:

I)decline in guard cell solutes

II) lowering of osmotic potential of guard cell

III) rise in potassium levels in guard cells

IV)movement of water from neighbouring cells to guard cells

V) guard cells becoming flaccid "

The answer to this question is given as II, III and IV

My doubt is why can it not be I, III and IV.

Because when there is a decline in guard cell solutes, it infers that there has been a movement of water from neighbouring cells to guard cells right?

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Solution

Solutes from neighbouring epidermal and mesophyll cells enter the guard cells lowering its osmotic potential and water potential. This lowered water potential and osmotic potential will allow movement of water into guard cells from neighbouring cells. Guard cells become turgid due to water accumulation in them which results in the opening of the guard cells.

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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

H^{+} - K^{+}

K^{+}

H^{+}

K^{+}

K^{+}

C l^{-}

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