A “53” form of these hormones is a major product formed in the 13-hydroxylation pathway. Pro·hexa·dione inhibits the synthesis of these hormones by antagonizing a namesake 3-oxidase. Defects (15[1])in negative regulators of these hormones, such as La and Cry, induce the generation of “slender” constitutive response mutants. The synthesis of these hormones begins with the conversion of GGPP to ent-kaurene. These hormones induce aleurone (“al-YOO-rone”) cells to (15[1])release (*) alpha-amylase. These hormones act against abscisic acid to break seed dormancy and promote germination. (10[1])These hormones, which are named (10[2])for a fungus that causes (10[1]-5[1])foolish seedling disease in rice plants, target the meristem to initiate internodal growth. For 10 points, name these stem-elongating hormones (-5[1])abbreviated as GAs. ■END■ (10[3])