OBSOLETE plant life cycle phase true The life cycle of all plants is characterized by the alternation of phases (or generations). The sporophytic phase has twice the chromosome complement of the gametophytic phase. 植物生活環段階 (Japanese, exact) plant_structure_development_stage PO:0028001 2010-07-15T02:54:57Z fase del ciclo de vida de la plant (Spanish, exact) rwalls OBSOLETE. A plant growth and development phase that begins with either meiosis or fertilization.