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

I. Lowering of osmotic potential of guard cells.
II. Decline in guard cell solute.
III. Rise of potassium ion level in guard cells.
IV. Guard cells absorb water from neighboring epidermal cells.
V. Guard cells become flaccid.

III, I, IV, V

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I, II, III, IV, V

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III, I, IV

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III, I, IV, II, V

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Solution

The correct option is C III, I, IV
The guard cells are specialized cells present in epidermis of leaves. The two guard cells enclose a pore in between them, known as stomatal pore. The guard cells control the opening and closing of the stomatal pore. The stomatal pore opens when guard cells are turgid and closes when guard cells become flaccid.

As the concentration of potassium ions increases inside the guard cells, the osmotic potential decreases. Due to this, the guard cells absorb water from neighbouring subsidiary cells and become turgid. This causes the outer walls of guard cells to bulge and force the inner walls into a crescent shape. This results in the opening of stomata.

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Similar questions

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

I. Lowering of osmotic potential of guard cells.
II. Decline in guard cell solute.
III. Rise of potassium ion level in guard cells.
IV. Guard cells absorb water from neighboring epidermal cells.
V. Guard cells become flaccid.

Q. Select the correct events leading to the opening of the stomata. I. Decline in guard cell solutes. II. Lowering of osmotic potential of guard cells. III. Rise in potassium levels in guard cells. IV. Movement of water from neighbouring cells into guard cells. V. Guard cells becoming flaccid.

"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?

Q. Which of the following statement is correct regarding opening and closing of stomata?
(i) stomata opens when guard cells are turgid.
(ii) stomata closes when guard cells are turgid.
(iii) stomata opens when guard cells are flaccid.
(iv) stomata closes when guard cells are flaccid.

Q. According to

H^{+} - K^{+}

exchange pump mechanism of stomatal movement
I.

K^{+}

ions accumulate in guard cells during the day.
II.

H^{+}

ions are pumped out from guard cells and

K^{+}

ions are pumped into guard cells.
III. Water potential of guard cells decreases with the accumulation of

K^{+}

ions together with

C l^{-}

and organic acid ions.
IV. Water enters into guard cells from epidermal and mesophyll cells due to decreased water potential of guard cells.

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