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Abscisic Acid

Stomatal clos...

Question

Stomatal closing during full sunlight is best defined by

A

Hormonal control

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B

K^{+}

ion hypothesis

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C

C O_{2}

concentration

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D

Auxin effect

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Solution

The correct option is C Hormonal control
Many hormone-like abscisic acid (for closing) cytokinin (for opening) and ethylene (for opening and closing both) are responsible for opening and closing of stomata.
So the correct option is 'Hormonal control'.

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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. The opening and closing of the stomatal pores depends upon:
(a) oxygen
(b) water in guard cells
(c) temperature
(d) concentration of CO₂ in stomata

Q. Stomatal opening and closing involves the role of various ions. In the given figure, arrows depict the movement of certain ions during stomatal opening in light. Identify the ions(P, Q, R and S) and select the correct option.

Assertion (A):Cytokinins induce stomatal opening

Reason(R): Cytokinins increase K+ ion concentration in guard cells

Q. Which of the following does not happen during stomatal opening and closing?

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