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Stomata: Opening and Closing

In guard cell...

Question

In guard cells, when sugar is converted into starch, the stomatal pore

A

Opens fully

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B

Opens partial

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C

Closes completely

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D

Remian unchanged

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Solution

The correct option is C Closes completely
Starch sugar interconversion theory was given by Steward. According to this theory stomata open due to accumulation of sugars and conversion of sugar to starch leads to closure of stomata.

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Q. Starch of guard cells is converted into PEP through

Q. Why does the sugar present in guard cells turn into starch at night??????

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. Through which process, starch of the guard cell is converted into PEP ions?

Q. When turgidity is lost in guard cells, the stomatal pore

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