You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Biology

Stomata: Opening and Closing

During the ni...

Question

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

Increase in the water potential of guard cells

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Closure of stomata

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Wilting of leaves

No worries! We‘ve got your back. Try BYJU‘S free classes today!

pH of the guard cells increases

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

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.

Suggest Corrections

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. 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.

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

I. Lowering of osmotic potential of guard cells.

II. Decline in guard cell solvent.

III. Rise of potassium ion level in guard cells.

IV. Guard cells absorb water from neighboring epidermal cells.

V. Guard cells become flaccid.

VI. Guard cells swell and make a pore between them, water is lost

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

Join BYJU'S Learning Program

During the night, K+ and Cl− ions move passively out of the guard cells. This results in

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 Cl− 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.

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

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.