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Abscisic Acid

ABA causes te...

Question

ABA causes temporary closure of stomata when there is a shortage of water because it

A

delays cell division & cell elongation

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B

interferes with the transport of $K^{+}$ ions into the guard cells

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C

causes rapid abscission of leaves & flowers

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D

it stops mitosis in vascular cambium during winter season

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Solution

The correct option is B
interferes with the transport of $K^{+}$ ions into the guard cells

ABA changes the permeability of guard cells membrane thereby interfering with the transport of potassium ions. This results in the closure of the stomata when there is a shortage of water.

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Similar questions

ABA causes temporary closure of stomata when there is a shortage of water because it

Q. Stomatal movements are influenced by a number of environmental factors. Which of the following statements is/are incorrect regarding this?
(i) Blue light keeps stomata open during the day promoting the movement of

K^{+}

ions into guard cells.
(ii) Increased

C O_{2}

concentration reduces the pH of guard cells which promotes conversion of sugar into starch, ultimately causing closure of stomata.
(iii) Abscisic acid, under stress conditions, causes rapid movement of

K^{+}

ions into guard cells.
(iv) Highly concentrated sucrose or salt solution when applied over to stomata, results in stomatal opening.

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. Plant hormone causing abscission of leaves, senescence, bud dormancy and inhibition of cell division is

Q. Assertion :Application of cytokinins causes the opening of stomata. Reason: Cytokinins induce the influx of potassium ions into guard cells.

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