(D) Abscisic acid $(ABA)$ is a plant growth inhibitor. It plays a crucial role in the abscission of leaves,flowers,and fruits. Spraying $ABA$ induces

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(D) Abscisic acid $(ABA)$ is a plant growth inhibitor. It plays a crucial role in the abscission of leaves,flowers,and fruits. Spraying $ABA$ induces rapid leaf fall (abscission). Additionally,it promotes dormancy in buds and seeds,helping plants survive unfavorable environmental conditions.