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During the ni...

Question

During the night, $K^{+}$ and $C l^{-}$ ions move passively out of the guard cells. This results in

A

Increase in the water potential of guard cells

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B

Closure of stomata

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C

Wilting of leaves

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D

pH of the guard cells increases

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Solution

The correct options are
A
Increase in the water potential of guard cells

B
Closure of stomata

In the absence of light, the $K^{+}$ and $C l^{-}$ ions move out of the guard cells due to which the water potential of guard cell increases and water move out leading to the closure of stomata.

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Similar questions

During the night, $K^{+}$ and $C l^{-}$ ions move passively out of the guard cells. This results in

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. 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. 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.

Q. Identify the correct statement from the following :

I. Accumulation of

K^{+}

ions in the guard cell does not require energy.
II. A high pH favoures stomatal opening.
III. Movement of chloride ions into guard cells is in response to the electrical differential created by

K^{+}

ions
IV. With the entry of several

K^{+}

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

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