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Abscisic Acid

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Question

Find out the incorrect statement with reference to the guard cells of photoactive stomata in presence of light

A

K⁺ accumulation increases

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B

pH of guard cell increases

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C

Solute content increases

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D

Water potential of guard cell increases

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Solution

The correct option is D
Water potential of guard cell increases

In the presence of light accumulation of $K^{+}$ ions is coupled with $C l^{-}$ ions. Efflux of protons leads to increase in $p H$ of guard cells. Water potential of guard cells decreases and water enters into them. Guard cells become turgid and stoma opens.

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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. Statement 1: Guard cells contain chloroplasts.
Statement 2: Stomata are surrounded by guard cells.

Q. 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.

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. 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.

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