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Which one of the following pairs, is not correctly matched?

1. Gibberellic acid - Leaf fall
2. Cytokinin - Cell wall elongation
3. IAA - Cell wall elongation
4. Abscissic acid - Stomatal closure

Correct answer: Cytokinin - Cell wall elongation

Solution

Cytokinin primarily stimulates cell division and delays senescence; it is not the hormone classically associated with cell wall elongation. The other pairs are correctly matched: IAA promotes elongation, abscisic acid causes stomatal closure, and gibberellic acid is linked with growth responses including leaf fall-related processes.

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