3-Indoleacetic acid wani nau'in shuka ne. Auxin yana da tasirin ilimin lissafi da yawa, waɗanda suke da alaƙa da natsuwarsa. Concentrationaramin hankali zai iya haɓaka girma, kuma yawan maida hankali zai hana girma har ma ya kashe tsire-tsire. Wannan tasirin tasirin yana da alaƙa da ko zai iya haifar da samuwar ethylene. Hanyoyin ilmin lissafi na auxin ana bayyana akan matakan biyu. A matakin salula, auxin na iya haifar da rarrabuwa daga kwayoyin cambium; ta da elongation na rassan kuma hana ci gaban ƙwayoyin tushen; inganta bambance-bambancen xylem da kwayoyin phloem, inganta tushen yankewa, da kuma daidaita yanayin halittar kira. A gaba da dukkan tsirrai, auxin yana aiki ne daga dasawa zuwa yayan itace. Auxin yana sarrafa ikon hana jan haske na munafurcin elongation a cikin shuki; lokacin da yake canzawa zuwa ƙasan harbe-harbe, yana samar da geotropism reshe; lokacin da yake canzawa zuwa gefen hasken baya na harbe, yana samar da hoton phototropism; 3-Indoleacetic acid yana haifar da fa'idar motsa jiki kuma yana jinkirta saurin tsufa. Auxin yana inganta fure, yana haifar da ci gaban 'ya'yan itace parthenocarpic, kuma yana jinkirta balagar' ya'yan itace.