Evolyutsion taraqqiyot natijasida gulning hosil bo’lishi, gulning tuzilishi (qismlari), formulasi, diagrammasi, gul qismlarining gul o’rnida joylanishiga qarab xillari, changchi , urug’chining tuzilishi, gulda kеtadigan changlanish, urug’lanish jarayonlarini o’rganish.