Likarabelo tsa Leseli: Mekhoa ea Bohlokoa ho Photosynthesis
Photosynthesis ke e 'ngoe ea lits'ebetso tsa bohlokoa ka ho fetisisa tsa biochemical Lefatšeng, tsa bohlokoa bophelong ba hoo e ka bang lintho tsohle tse phelang. Ts'ebetso ena e etsoa haholo-holo ke limela, bolele, le libaktheria tse ling, tse nkang matla a tsoang khanyeng ea letsatsi ho fetola carbon dioxide le metsi hore e be glucose le oksijene. Photosynthesis e arotsoe ka mekhahlelo e 'meli e meholo: karabelo ea leseli le karabelo e lefifi (kapa potoloho ea Calvin). Sengoloa sena se tla hlahloba karabelo ea leseli, karolo ea pele le ea bohlokoa ea photosynthesis.
Selelekela sa Likarabelo tsa Leseli
Likarabelo tsa leseli, tse tsejoang hape e le likarabelo tsa leseli, ke karolo e itšetlehileng ka khanya ea photosynthesis. Ts'ebetso ena e etsahala ho thylakoids, e leng meaho ea lera ka har'a li-chloroplast tse nang le li-pigment tsa photosynthetic tse kang chlorophyll. Likarabelong tsa leseli, matla a leseli a monngoang ke li-pigment tsa photosynthetic a fetoloa matla a lik'hemik'hale ka mokhoa oa adenosine triphosphate (ATP) le nicotinamide adenine dinucleotide phosphate (NADPH).
Karolo ea leseli karabelong ena ke eona e le fang lebitso la "karabelo ea leseli." Ntle le leseli, karabelo ena e ke ke ea etsahala, hobane li-photon tse tsoang leseling ke mohloli oa matla o tsamaisang ts'ebetso eohle.
Mokhoa oa Karabelo ea Leseli
Likarabelo tsa leseli li ka aroloa ka mekhahlelo e 'maloa e hokahaneng. Tse latelang ke likarolo tse ka sehloohong tsa likarabelo tsa leseli:
1. Ho Monya Leseli le ho Hlohlelletsa Elektrone:
– Ts'ebetso ena e qala ha photon e otla molek'hule ea chlorophyll ho photosystem II (PSII). Matla a tsoang ho photon a etsa hore lielektrone tse molek'huleng ea chlorophyll li thabele matla a phahameng.
– Lielektrone tsena tse hlasimolohileng li fetisetsoa ho moamoheli oa pele oa lielektrone ketane ea lipalangoang tsa lielektrone.
2. Pholisi ea Metsi (Ho Aroha ha Metsi):
– Ho nkela dielektrone tse lahlehileng ho tswa ho PSII sebaka, dimolek'hule tsa metsi di feta fotolysis; H2O e arolwa hore e be oksijene, diprothone le dielektrone.
– Oksijene ke sehlahisoa se tswang ho karabelo ena mme e lokollwa sepakapakeng, ha dielektrone di sebediswa ho nkela dielektrone tse fetisetswang ho tswa ho PSII sebaka.
3. Ketane ea Lipalangoang tsa Elektrone:
– Lielektrone tse thabileng li tsamaea ka har'a letoto la li-complex tsa protheine ea lera le limolek'hule tsa carrier ea lielektrone tse bitsoang ketane ea lipalangoang tsa lielektrone.
– Ha dielektrone di ntse di tsamaya ka hara ketane ena, matla a tsona a sebediswa ho pompa diprothone ho pholletsa le lera la thylakoid, ho theha gradient ya electrochemical kapa bokgoni ba eneji.
4. Sebopeho sa Photosystem I (PSI) le NADPH:
– Kamora ho feta ka har'a ketane ea lipalangoang tsa lielektrone, lielektrone li fihla tsamaisong ea photosystem I (PSI).
– Mona, photon e 'ngoe e baka ho tsosolosoa ha elektrone, ebe e fetisetsoa ho NADP+ ho etsa NADPH, molek'hule ea bohlokoa e sebelisoang liketsong tse lefifi tsa photosynthesis.
5. Ho kopanngoa ha ATP (Photophosphorylation):
– Moedi wa proton o bopilweng ka hara thylakoid o sebediswa ke ATP synthase, e leng enzyme e hlahisang ATP ho tswa ho ADP le inorganic phosphate (Pi) ka photophosphorylation.
Bohlokoa ba Karabelo ea Leseli
Likarabelo tsa leseli ke karolo ea bohlokoa ea photosynthesis hobane li hlahisa ATP le NADPH, tseo ka bobeli li hlokahalang bakeng sa mohato o latelang, potoloho ea Calvin. ATP e fana ka matla a hlokahalang bakeng sa liketso tse fapaneng tsa biochemical, ha NADPH e fana ka lielektrone tse hlokahalang bakeng sa ho fokotsa carbon dioxide ho etsa glucose.
Ho feta moo, dikarabelo tsa lesedi di phetha karolo ya bohlokwa ho hlahiseng oksijene eo re e hemang letsatsi le letsatsi. Ka ho folisa metsi ka photolysis ho PSII, oksijene e lokollwa e le sehlahisoa se latelang, seo ebe se kopana le sepakapaka mme se tshehetsa ho hema ha aerobic dibopuweng tse phelang.
Mabaka a Amang Likarabelo tsa Leseli
Katleho ea liketso tsa khanya e susumetsoa ke lintlha tse 'maloa, ho kenyeletsoa matla a khanya, bolelele ba khanya, ho fumaneha ha metsi le mocheso oa tikoloho.
– Matla a Leseli: Matla a leseli a etsa qeto ea hore na ke matla a makae a fumanehang ho khanna karabelo. Ha matla a le holimo, lielektrone lia thaba haholo.
– Bolelele ba Maqhubu a Leseli: Di-pigment tsa photosynthetic di arabela hantle maqhubung a itseng a maqhubu. Mohlala, chlorophyll e monya lesedi le lefubedu le leputswa ka bokgoni bo phahameng, empa ha e sebedise lesedi le letala hantle.
– Ho fumaneha ha Metsi: Metsi aa hlokahala bakeng sa photolysis, 'me khaello ea ona e ka emisa karabelo ea khanya.
– Mocheso: Li-enzyme tse amehang liketsong tsa leseli li na le mocheso o motle oo li sebetsang ho oona hantle.
Ho koala
Likarabelo tse bobebe tsa photosynthesis li bontša mekhoa e bohlale ea lik'hemik'hale eo tlhaho e e fetotseng ho sebelisa mehloli e fumanehang le matla a bophelo. Ts'ebetso ena ha e tšehetse feela litlhoko tsa matla tsa semela empa hape e fana ka oksijene le matla tikolohong e pharaletseng. Ho utloisisa sena ka botebo ho re fa kananelo ea ho mamella le bokhoni ba limela ho phelisa bophelo Lefatšeng.
Ka dipatlisiso tse ding, saense ya dikarabelo tsa lesedi le photosynthesis ka kakaretso e ka fana ka temohisiso bakeng sa boqapi ba matla a ntjhafatswang le temo, e fana ka ditharollo bakeng sa botsitso ba tikoloho ba nako e telele.
