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Role of NPK

Potassium ion...

Question

Potassium ions concentration is more in guard cells when stomata is open. This was reported by

A

Hsio, Fisher

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B

Fujino

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C

Levitt

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D

Lioyd

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Solution

The correct option is B Fujino
The mechanism with which water moves into the guard cells has been explained to be due to active potassium ion transport mechanism. Fujino (1967) observed through his experiments that stomata opens when there is an influx of potassium ions into the guard cells. ATP helps in the entry of K+ ions into the guard cells. The increase in the concentration of potassium ions increases the osmotic concentration of the guard cells thereby leading to the opening of the stomata.

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Similar questions

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. Which ion is accumulated in the guard cells before opening of stomata?

Q. For keeping stomata open, besides

K^{+}

ions the guard cells require a constant supply of

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.

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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