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Standard XII

Biology

Role of NPK

Select the co...

Question

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.

I and V

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II, III and IV

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II, III and IV

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III and V

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Solution

The correct option is B II, III and IV
Lowering of osmotic potential of guard cells ,Rise in potassium levels in guard cells,movement of water from neighbouring cells into guard cells.

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Similar questions

"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. 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. 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.

Q. Assertion: Opening and closing of stomata is controlled by guard cells.
Reason: Shrinking of guard cells results in the opening of stomatal pore.

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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.

The correct option is B II, III and IVLowering of osmotic potential of guard cells ,Rise in potassium levels in guard cells,movement of water from neighbouring cells into guard cells.

The correct option is B II, III and IV
Lowering of osmotic potential of guard cells ,Rise in potassium levels in guard cells,movement of water from neighbouring cells into guard cells.