Give scientific reasons: Gibberellic acid induces reversal of dwarfism in many genetically dwarf plants.

(N/A) In genetically dwarf plants,the endogenous level of $GA$ (Gibberellic acid) is typically low.
When $GA$ is supplied externally to these plants,it stimulates internode elongation by promoting both cell division and cell enlargement.
This rapid growth overcomes the genetic limitation,resulting in the reversal of the dwarf phenotype.