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Photosynthesis- Introduction

ABA causes te...

Question

ABA causes temporary closure of stomata when there is a shortage of water because it

A

Delays cell division and cell elongation

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B

Interferes with the transport of $K^{+}$ ions into the guard cells

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C

Causes rapid abscission of leaves and flowers.

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D

It stops mitosis in vascular cambium during winter season.

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Solution

The correct option is B
Interferes with the transport of $K^{+}$ ions into the guard cells

ABA changes permeability of guard cell's membrane.

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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. According to

H^{+} - K^{+}

exchange pump mechanism of stomatal movement
I.

K^{+}

ions accumulate in guard cells during the day.
II.

H^{+}

ions are pumped out from guard cells and

K^{+}

ions are pumped into guard cells.
III. Water potential of guard cells decreases with the accumulation of

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C l^{-}

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IV. Water enters into guard cells from epidermal and mesophyll cells due to decreased water potential of guard cells.

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Q. What causes the opening and closing of guard cells of stomata during transpiration?

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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