Which of these do not cause stomatal opening?

Influx of

K^{+}

ions

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Light

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High

C O_{2}

concentration

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Circadian rhythm

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Solution

The correct option is C High $C O_{2}$ concentration
Stomata are the structure meant for the exchange of gases and loss of water present in leaves. It's opening is regulated by many factors such as accumulation of potassium ions in guard cells, exposure to the appropriate light intensity and circadian rhythm but high carbon dioxide concentration does not cause opening of stomata while it causes the closing of stomata.
So, the correct answer is 'High carbon dioxide concentration'.

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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.

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