Uhlelo lokungenisa umoya obamba ukushisa ludlala indima ebalulekile empilweni yezitshalo nasekukhiqizeni izitshalo.Izazi zezitshalo eziningi ezisanda kuzalwa azisho ukuthi ukukhula kancane, isivuno esiphansi, noma izinkinga zamagciwane ngenxa yesistimu yokungenisa umoya ebamba ukushisa enganele.Iningi labalimi liyakuqonda ukubaluleka kwezinhlelo zokungenisa umoya zokulawula izinga lokushisa kodwa izinzuzo ezitholakala ezinhlelweni zokungenisa umoya ziningi.Akuzona nje kuphela izinhlelo zokungenisa umoya ezibalulekile ekulondolozeni izimo zemvelo kodwa futhi zithonya ngokuqondile ikhono lesitshalo lokwenza i-photosynthesis, ukuthatha izakhi ezibalulekile, kanye nomjikelezo ophelele wokuzala (impova).Amasistimu wokungenisa umoya obamba ukushisa enza imisebenzi emine ebalulekile: ukulawula izinga lokushisa, ukulawula umswakama, ukushintshwa kwe-CO2/oxygen, kanye nokujikeleza komoya.
