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Abscisic Acid

What will be ...

Question

What will be the effect of accumulation of $K^{+}$ ions in guard cells?

A

Water potential increase

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B

Water potential decrease

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C

Loss of turgidity

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D

Exosmosis

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Solution

The correct option is B Water potential decrease
Accumulation of $K^{+}$ ions in guard cells, will decrease water potential. Consequently water will move inside the guard cells from surrounding cells, making them turgid. When the guard cells are turgid, the stomatal pore will open.
So, the correct answer is 'Water potential decrease'

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Similar questions

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. The effect of accumulation of

K^{+}

ions in guard cells

Q. Identify the correct statements and find out the correct combination?
1. Accumulation of

K^{+}

ions in guard cell does not require energy.
2. A high pH favors stomatal opening.
3. Movement of chloride ions into guard cells is in response to electrical differential created by

K^{+}

ions.
4. With the entry of several

K^{+}

ions and chloride ions, the water potential of guard cells increases.

Q. Accumulation of

K^{+}

ions in guard cells shall cause

Q. Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.

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