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Opening and Closing of the Stomata

Loss of k+ ...

Question

Loss of $k^{+}$ ion ..... osmotic concentration of guard cells on compared to adjacent epidermal cell

A

Decreases

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B

Increases

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C

Both A and B

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D

None of the above

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Solution

The correct option is A Decreases
Loss of $k^{+}$ ions decreases the osmotic concentration of guard cells as compared to adjacent epidermal cells. This causes exosmosis and hence turgidity of guard cell decreases.

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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. 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^{+}

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III. Water potential of guard cells decreases with the accumulation of

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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. Glucose _______ the osmotic concentration of guard cell.

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. A well stained leaf peel mount when observed under the high power of a microscope shows nuclei in :
(1) only epidermal cells
(2) only guard cells
(3) guard cells and epidermal cells
(4) guard cells, epidermal cells and stoma

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