Choose the incorrect pair.

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(A) The incorrect pair is $A$. Gibberellic acid $(GA_3)$ is primarily involved in stem elongation,seed germination,and breaking dormancy. It does not

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Gibberellic acid - leaf fall

Vedclass · Answer

(A) The incorrect pair is $A$. Gibberellic acid $(GA_3)$ is primarily involved in stem elongation,seed germination,and breaking dormancy. It does not promote leaf fall (abscission). In fact,abscisic acid $(ABA)$ is the hormone primarily responsible for promoting abscission (leaf fall). Cytokinins are known to delay senescence by promoting nutrient mobilization. $IAA$ (Indole$-3-$acetic acid) is an auxin that prevents the abscission of young leaves and fruits. $ABA$ is a growth inhibitor that inhibits seed germination and promotes dormancy.

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