Esikoleni nasesikhungweni ngiyakhumbula ukuthi njalo lapho ngibuza Kungani izitshalo ziluhlazaBangiphendula cishe ngaso sonke isikhathi ngokufanayo: ngoba bane-pigment, i-chlorophyll, ebanika lowo mbala. Futhi kunjalo, ngokusho kwezazi zezitshalo. Kepha ... ngihlale nginombuzo wokwazi kabanzi, kuthiwani ngawe?
Kanjalo. Ngenhlanhla, izazi zezitshalo (ngukuthi) zingochwepheshe ngokwengeziwe emkhakheni, futhi zikwazile ukuthola okuthe xaxa ngalesi sihloko. Yilokhu abakutholile kuze kube manje.
Izinto eziphilayo ze-photosynthetic, okungukuthi, lezo eziguqula amandla elanga zibe ukudla futhi zikusebenzise ukuze zikhule, njengezitshalo kodwa nama-bacteria, zinombala othile. Kepha banalo mbala ngesizathu: lapho bethola ukukhanya kwenkanyezi yenkanyezi, ingena kuma-chlorophyll molecule ombala owodwa. Ngale ndlela, bangakwazi ukuzivikela ngokuzenzekelayo ekushintsheni kwelanga.
Esimweni esithile sezitshalo, Lezi zinombala oluhlaza ngoba kubo lelo uhla lwemibala ye-spectrum yelanga abayiphuzayo, ukuphela kwento efanelekile ngempela, ngaleyo ndlela igweme ukusha.
Lokhu kuchaza ukuthi kungani isitshalo esichayeke elangeni okokuqala ngqa sithola umonakalo: amaseli aphethe ukumunca amandla elanga awalungiselelwa, ngakho-ke adinga inqubo 'yokufunda' nokuzivumelanisa nezimo, into abazoyenza noma nini lapho kufakwa izakhi zofuzo kudingekile. ukuthi ukukhanya kukhule; okungukuthi, ngokwesibonelo i-fern, ehlala emthunzini, ayisoze yakwazi ukujwayela ukuhlala endaweni enelanga.
Kepha kusekhona okunye. Ngokusho kwabaphenyi, izitshalo zizenzele umvikeli wazo we-UV. Njengoba sazi, ukutholakala isikhathi eside emisebeni ye-UV kungadala ukusha ngisho nomdlavuza wesikhumba, izitshalo nazo zingalimala: ukulahleka ngokweqile kwamanzi okungaholela ekuphelelweni amanzi emzimbeni, ekushisweni, nasezimweni ezimbi kakhulu, ukufa.
Ukugwema lokhu, ngokumangazayo, baphinde benze i-photosynthesize. Ukuze kube lula ukuyiqonda, ingaqhathaniswa nalokho okwenzekayo lapho unisela ibhodwe eligcwaliswe nge-substrate eyomile futhi eqinile. Kulezi zimo, amanzi aphuma emigodini yokukhipha amanzi ebhodweni aphakeme kakhulu kunalokho abengakwenza ukube leyo nhlabathi ibikwazi ukuwumunca.
Uma ngesikhathi se- i-photosynthesis, njengalapho unisela umhlabathi ohlangene kakhulu, ukugeleza kwamandla elanga maqondana namaqabunga kukhulu kunamaseli aphethe ukuwamunca, kuzodingeka ukuthi ajwayele ngokushesha ngangokunokwenzeka ukujwayela futhi ngaleyo ndlela anciphise umthelela walokhu kuchichima kwamandla avela elangeni. Uma ungakwenzi, lesi sitshalo sizozama ngandlela thile ukukhipha lawo mandla, ngaleyo ndlela senze lokho okwaziwa ngokuthi yi-oxidative stress, okuzolimaza amaseli.
Kuyathakazelisa, akunjalo?
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