Which one of the following pairs is not correctly matched?

IAA -Cell wall elongation

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Abscisic acid -Stomatal closure

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Gibberellic acid -Leaf fall

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Cytokinin -Cell division

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Solution

The correct option is C
Gibberellic acid -Leaf fall

Gibberellic acid is a plant hormone that promotes cell elongation of both leaves and stems in general and internodal length of genetically dwarf plants in particular. It is, in general, a growth promoting hormone and does not inhibit growth. So, leaf abscission is not associated with gibberellic acid but with abscisic acid.

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Similar questions

Identify the pair that is correctly matched from the given.

Auxin – cell division
Gibberellin – internodal elongation
Cytokinin – fruit ripening
Ethylene – apical dominance

Q. Pick up the correct statements.
(A) Cytokinins promote cell division.
(B) Auxins promote growth.
(C) Abscisic acid promotes growth.
(D) Gibberellins inhibit growth.

Q. Choose the right from the following.
(i) In light, hormone auxin, helps the cells to grow longer in plants.
(ii) Plant hormone gibberellins help in growth of a stem.
(iii) Cytokinin inhibits cell division.
(iv) Abscisic acid promotes growth in plants.

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. Match the plant hormones listed in column I with their major role listed in column II and select the corret option from the codes given below.

Column I	Column II
(A) Auxin	(i) Fruit ripening
(B) Cytokinin	(ii) Phototropism
(C) Abscisic acid	(iii) Suppression of cell division
(D) Ethylene	(iv) Stomatal opening and closing
	(v) Growth of lateral buds

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