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Auxin -responsible for phototropisms -enhances plant growth upward rather than laterally Cytokinins -stimulate cytokinesis and cell division Gibberellins -promote stem and leaf elongation -promote cell growth Abscisic Acid -inhibits growth -enables plant to withstand drought -closes stomates during times of water stress Ethylene -gaseous -promotes fruit ripening -facilitates apoptosis (cell death) -promotes leaf abscission (leaf falls off and dies)