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Plant Nutrient Deficiency

Increase in ...

Question

Increase in $C O_{2}$ concentration around leaf results in

A

Rapid opening of stomata

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B

Partial closing of stomata

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C

Complete closure of stomata

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D

There will be no effect on stomatal opening

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Solution

The correct option is B Partial closing of stomata
Increased carbon dioxide concentration inhibits potassium ion influx into the guard cells, while protons and malate ions combine to form malic acid, which is converted to starch. These changes lead to loss of potassium ions which decreases osmotic potential, which causes exosmosis, lowers turgidity and as a result guard cells become flaccid and stomata are closed.

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Similar questions

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 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. Assertion: Opening and closing of stomata is controlled by guard cells.
Reason: Shrinking of guard cells results in the opening of stomatal pore.

Q. Steward's theory of stomatal opening and closure assumes the pressure in the guard cells, of the following enzymes

Q. Explain the mechanism of stomatal opening and closing.

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