Multiple choice Which of the following hormones causes delay in senescence? Indole butyric acid Gibberellic acid Cytokinin Abscisic acid Reveal answer Fill a bubble to check yourself C Correct answer Explanation Cytokinins are known to delay senescence in leaf tissues and promote mitosis. Cytokinins act in concert with auxin, another plant growth hormone. The two are complementary, having generally opposite effects.