Multiple choice The growth and elongation of cells in plants is promoted by γ-butyrolactone γ-hydroxybutyric acid geraniol gibberellic acid Reveal answer Fill a bubble to check yourself D Correct answer Explanation Gibberellic acid is a hormone found in plants. Its chemical formula is C19H22O6. When purified, it is a white-to-pale-yellow solid. Gibberellic acid is a simple gibberellin, a tetracyclic diterpene acid promoting growth and elongation of cells.