Influx of $K^{+}$ ions into guard cells and efflux of $H^{+}$ ions from guard cells leads to

Exosmosis

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Plasmolysis

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Closing of stomata

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Opening of stomata

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Solution

The correct option is D Opening of stomata
Stomata opens and closes due to water and ion movement. When the light falls on the parts of plant, chloroplast carries out photosynthesis. ATP from photosynthesis powers sodium and potassium pump. Then the K+ ions are pumped into the guard cells, by creating a concentration gradient. For this uptake of K+ ions it requires protons (H+) ions then, K+ ions are exchange for the protons H+. Uptake of K+ ions is referred as influx of K+ ions into guard cells and outward movement of H+ ions is referred as efflux of H+ ions. This is an active ionic exchange and requires ATP energy and cytokinin (a plant hormone). In this way, the concentration of K+ ions increases in guard cells and at the same time, the concentration of H+ ions decreases in guard cells. As a result of this, guard cells swells and stomata opens.
So, the correct answer is option D.

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

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. For keeping stomata open, besides

K^{+}

ions the guard cells require a constant supply of

During the day, chloroplasts in the guard cells photosynthesise, which leads to the production of ___. This is used to actively pump the ___ ions of the adjacent cells into the guard cells.

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Influx of K+ ions into guard cells and efflux of H+ ions from guard cells leads to

Influx of $K^{+}$ ions into guard cells and efflux of $H^{+}$ ions from guard cells leads to