Geotropism yana nufin girma ko motsi na kwayoyin halitta don mayar da martani ga nauyi, yawanci zuwa ko nesa daga tsakiyar Duniya. Wannan lamari kuma ana kiransa da gravitropism, kuma yana da yawa a cikin tsire-tsire, inda yake taimakawa tushen tsiro zuwa ƙasa da harbe-harbe don girma daga gare ta. Geotropism wani nau'in zafi ne, wanda shine martanin jagora na kwayoyin halitta zuwa abin motsa jiki na waje, kamar haske, taɓawa, ko nauyi.