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Cytokinin

Assertion A:C...

Question

Assertion (A):Cytokinins induce stomatal opening

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

A

Both A

&

R are true and R explains A

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B

Both A

&

R are true and R does not explain A

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C

A is true and R is false

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D

Both A

&

R are false

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Solution

The correct option is A Both A $&$ R are true and R explains A
Cytokinins increase K+ ion concentration in guard cells and help in stomatal opening.

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Similar questions

Assertion (A):Cytokinins induce stomatal opening

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

Q. Assertion :Application of cytokinins causes the opening of stomata. Reason: Cytokinins induce the influx of potassium ions into guard cells.

Q. Assertion :Cytokinins increase the shelf life of fruits and vegetables. Reason: Cytokinins induce cell division.

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. Identify the correct statements and find out the correct combination?
1. Accumulation of

K^{+}

ions in guard cell does not require energy.
2. A high pH favors stomatal opening.
3. Movement of chloride ions into guard cells is in response to electrical differential created by

K^{+}

ions.
4. With the entry of several

K^{+}

ions and chloride ions, the water potential of guard cells increases.

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