(A) $ABA$ (Abscisic Acid) is a plant growth inhibitor that plays a major role in the abscission of leaves,flowers,and fruits. During leaf senescence a

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(A) $ABA$ (Abscisic Acid) is a plant growth inhibitor that plays a major role in the abscission of leaves,flowers,and fruits. During leaf senescence and the process of leaf fall,the concentration of $ABA$ increases in the plant tissues to promote the formation of the abscission layer.