Maitiro eChiedza: Maitiro Akakosha muPhotosynthesis
Photosynthesis ndeimwe yemaitiro akakosha ebiochemical pasi pano, ayo akakosha kuhupenyu hwezvinhu zvipenyu zvese. Maitiro aya anonyanya kuitwa nezvirimwa, algae, uye mamwe mabhakitiriya, ayo anobata simba kubva kuzuva kuti ashandure kabhoni dioxide nemvura kuita glucose neokisijeni. Photosynthesis yakakamurwa kuita zvikamu zviviri zvikuru: maitiro echiedza uye maitiro erima (kana kuti Calvin cycle). Chinyorwa chino chichaongorora maitiro echiedza, chikamu chekutanga uye chakakosha chephotosynthesis.
Nhanganyaya yeKuita kweChiedza
Kushanda kwechiedza, kunozivikanwawo sekushanda kwechiedza, idanho re photosynthesis rinotsamira kuchiedza. Maitiro aya anoitika mu thylakoids, maumbirwo emembrane ari mukati mema chloroplast ane pigments dze photosynthetic dzakadai se chlorophyll. Mukushanda kwechiedza, simba rechiedza rinotorwa ne photosynthetic pigments rinoshandurwa kuita simba remakemikari muchimiro che adenosine triphosphate (ATP) uye nicotinamide adenine dinucleotide phosphate (NADPH).
Basa rechiedza mukuita uku ndiro rinochipa zita rekuti "kuita kwechiedza." Pasina chiedza, kuita uku hakugone kuitika, nekuti maphotoni anobva kuchiedza ndiwo manyuko esimba anotungamira maitiro ese.
Maitiro eChiedza Chekuita
Maitiro echiedza anogona kupatsanurwa kuita zvikamu zvakasiyana-siyana zvakabatana. Izvi ndizvo zvikamu zvikuru zvemaitiro echiedza:
1. Kunyudzwa kwechiedza uye Kufadzwa kwemaerekitironi:
- Maitiro acho anotanga kana photon yarova chlorophyll molecule mu photosystem II (PSII). Simba rinobva mu photon rinoita kuti maerekitironi ari mu chlorophyll molecule afashukire kusvika padanho repamusoro resimba.
– Maerekitironi aya anofara anobva aendeswa kune acceptor yekutanga yeerekitironi mucheni yekufambisa maerekitironi.
2. Kuchenesa Mvura (Kupatsanura Mvura):
– Kuti maerekitironi akarasika kubva kuPSII atsiviwe, mamorekuru emvura anogadzirwa nephotolysis; H2O inoputswa kuita okisijeni, mapurotoni, nemaerekitironi.
– Okisijeni inokonzerwa nekuita uku uye inoburitswa mumhepo, ukuwo maerekitironi achishandiswa kutsiva maerekitironi anotamiswa kubva kuPSII.
3. Cheni yekufambisa maerekitironi:
– Maerekitironi anofara anofamba nepakati pemapuroteni akawanda emembrane uye mamorekuru anotakura maerekitironi anonzi electron transport chain.
– Sezvo maerekitironi achifamba nemucheni uyu, simba rawo rinoshandiswa kupomba mapurotoni pa thylakoid membrane, zvichigadzira electrochemical gradient kana simba.
4. Kuumbwa kwePhotosystem I (PSI) uye NADPH:
– Mushure mekupfuura nepakati pecheni yekufambisa maerekitironi, maerekitironi anosvika paphotosystem I (PSI).
– Pano, imwe photon inokonzera kudzokorora kweelectron, iyo inozoendeswa kuNADP+ kuti igadzire NADPH, molecule inokosha inoshandiswa mukuita kwerima kwe photosynthesis.
5. Kugadzirwa kweATP (Photophosphorylation):
– Kuyerera kweproton kunoumbwa muthylakoid kunoshandiswa neATP synthase, enzyme inogadzira ATP kubva kuADP uye inorganic phosphate (Pi) kuburikidza nephotophosphorylation.
Kukosha kweChiedza Chinochinja
Kushanda kwechiedza chinhu chakakosha mu photosynthesis nekuti zvinogadzira ATP neNADPH, zvose zviri zviviri zvinodiwa padanho rinotevera, Calvin cycle. ATP inopa simba rinodiwa pakuita kwakasiyana-siyana kwemakemikari, nepo NADPH ichipa maerekitironi anodiwa pakuderedza carbon dioxide kuti igadzire glucose.
Uyezve, mashandiro echiedza anoita basa guru mukugadzira okisijeni yatinofema zuva nezuva. Kuburikidza ne photolysis yemvura muPSII, okisijeni inoburitswa sechinhu chimwe chete, iyo inobva yabatana nemhepo uye inotsigira kufema kwemhepo muzvinhu zvipenyu.
Zvinhu Zvinokanganisa Maitiro Echiedza
Kushanda kwechiedza kunokonzerwa nezvinhu zvakasiyana-siyana, zvinosanganisira simba rechiedza, kureba kwechiedza, kuwanikwa kwemvura, uye tembiricha yenzvimbo.
– Kusimba kwechiedza: Kusimba kwechiedza kunosarudza huwandu hwesimba riripo kuti rifambise reaction. Kusimba kwacho kwakanyanya, maerekitironi akawanda anofashukira.
– Mwenje wechiedza: Pigments dzephotosynthetic dzinopindura zvakanaka kune mawavelength chaiwo. Semuenzaniso, chlorophyll inonwisa chiedza chitsvuku nebhuruu nekushanda kwakanyanya, asi haishandisi chiedza chegirini zvakanaka.
– Kuwanikwa kwemvura: Mvura inodiwa pakugadzira chiedza, uye kushomeka kwayo kunogona kumisa kupenya kwechiedza.
– Tembiricha: Ma enzymes anobatanidzwa mukuita kwechiedza ane tembiricha yepamusoro yaanoshanda nayo zvakanaka.
Penutup
Kushanda kwechiedza kwephotosynthesis kunoratidza mashandiro ehunyanzvi ebiochemical ayo zvakasikwa zvakashanduka kuti zvishandise zviwanikwa zviripo uye simba rehupenyu. Maitiro aya haangotsigiri chete zvinodiwa nemiti asi anopawo okisijeni nesimba kunharaunda yakakura. Kunzwisisa izvi zvakadzama kunotipa kunzwisisa kugona kwezvirimwa kuchengetedza hupenyu pasi pano.
Kuburikidza nekutsvaga kwakawedzerwa, sainzi yekuchinja kwechiedza uye photosynthesis zvese zvinogona kupa ruzivo rwekuvandudza simba rinogona kuvandudzwa uye kurima, zvichipa mhinduro dzekuchengetedza nharaunda kwenguva refu.
