Ngaba uyazi ukuba yintoni igeotropism? Oku kukuphendula kwezityalo ezenza ukuba zikhule kwaye zikhule njengoko zisenza; Oko kukuthi, ngokubanzi ngeengcambu ezantsi kunye nesiqu phezulu.
Ikwabizwa ngokuba ngumxhuzulane, kuba amandla omxhuzulane anempembelelo enkulu kwizityalo (kwaye enyanisweni kuyo yonke into: izinto eziphilayo, izinto ezingaphiliyo, ... yonke into). Kodwa, Yintoni le tropism inayo?
Yintoni igeotropism okanye i-gravitropism?
Kuthethwe ngamagama alula, i-geotropism yinto evumela iingcambu kunye neziqu ukuba zazi ukuba zikhule phi. Ke, eyokuqala iya kukhula iye ezantsi, oko kukuthi, kumbindi womhlaba, kunye nesiqu esiya phezulu, oko kukuthi, ukuya eLangeni.
Kungenxa yesi sizathu le nto ibaluleke kakhulu ngexesha lokuhluma kwembewu, kuba ukuqala ubomi kakuhle imbewu kufuneka ikwindawo elungileyo; Ngale ndlela, isithole siya kuba nakho ukukhula ngokuchanekileyo.
Iindidi
Zimbini iintlobo:
- I-geotropism engalunganga: zezinye iziqu ezikhoyo, kuba zezi zikhula zaya kwelinye icala ukuya kumxhuzulane.
- I-geotropism efanelekileyo: Oku kuvezwa ziingcambu, zezi zikhula ziye kumbindi womxhuzulane.
Izityalo zibufumana njani ubunzima bomxhuzulane?
Ukuphendula lo mbuzo kufuneka sithethe malunga iiseli zemifuno. Kuzo Kuyaziwa ukuba kukho inxenye, mhlawumbi ii-amyloplast, ezifumanisa ukukhawulezisa komxhuzulane yiyo ke loo nto ke eyenza iiseli zisebenze kwicala elifanelekileyo. Kodwa yintoni ii-amyloplast?
Ezi ziiplastos ezingenayo i-chlorophyll, ke ngoko azinayo i-photosynthetic capacity kwaye, ke, zinokuba negalelo kwimveliso yokutya, kodwa zinama-granules ashinyeneyo kakhulu. Ezi granules kukholelwa ukuba zisetyenziswa njengee-statolithsOko kukuthi, njenge-organelles ezihamba ngaphakathi kwe-cytoplasm ekuphenduleni kumxhuzulane (i-cytoplasm lulwelo lwe-gelatinous olwenziwe ngamanzi kunye neetyiwa ezijikeleze i-nucleus yeseli).
Ukubandakanyeka kwe-Gene
Imfuza ziikhowudi zolwazi ezenza ukuba singobani: abantu, izityalo, iikati, izinja, njl. kodwa zikwabonisa ixesha lethu lokuphila, ukuba sihlala sinesifo, kwaye kakhulu, ngakumbi. Imfuza lilizwe elinomdla njengoko linzima; Ngapha koko, ukukunika umbono, kuthathe iminyaka emine nangaphezulu kweesayensi ezili-100 ukulandelelana kwe-genome yeVirginia poplar emnyama (populus trichocarpaNgokutsho kwesango Igama lokuqala Cordis lithetha ntoni?.
Ke ngoko, ukuba sifuna ukwazi ngakumbi malunga nendlela amandla omxhuzulane azichaphazela ngayo izityalo, licebo elihle ukuphanda ngemfuza. Yiloo nto kanye eyenziwayo. Ukude kubengoku, Kubonakalisiwe ukuba ukuhlanganiswa kwemiyalezo ye-RNAs (Aba ngabo bajongene nokudlulisa ikhowudi yemfuza ye-DNA ukusuka kwiseli yeseli iye kwi-ribosome efumaneka kwisytoplasm), ekwabizwa ngokuba zii-SAURs (izifinyezo ezivela kwi-RNAs ezilawulwa kancinci). Iyakhuthazeka xa kongezwa ii-auxins (tyala iihomoni ezilawula ukukhula), kunye negeotropism eyenzeka kwii-hypocotyls zeembotyi zesoya.
Xa iimbotyi zikhula ngesiqhelo, oko kukuthi, ngokuthe nkqo, ii-gen ze-SAUR zisasazwa ngokulandelelana, kodwa xa amahlumelo ebekwe ngokuthe tye, olu hambo luguquka ngokukhawuleza, lujolise kwisiqingatha esisezantsi se-hypocotyl. Ke, isiqu sikhula senze ugoso esikhula ngaso ngokuthe nkqo (apha unaso isifundo, ukuba ufuna ukusifunda; Ewe, kunjalo ngesiNgesi).
Imizekelo yegeotropism
Singafumana imizekelo ngokushiya indlu: imithi kunye nemithi yesundu zezinye iintlobo zezityalo apho siza kubona kakuhle. Isiqu, esibizwa ngokuba yistipe ukuba ngumthi wesundu, sikhula ngakumbi okanye kancinci ngqo phezulu, sikhangela ilanga; iingcambu kwelinye icala asiziboni ngeliso lenyama kuba zingcwatywa xa zikhula phantsi.
Sinokwenza nolingo ngokwethu. Ukuba sihlwayela iilentile, umzekelo, kwimbiza encinci, eyi-5,5 iisentimitha ububanzi, silinda ukuba isithole simile kakuhle (oko kukuthi, de sibone iingcambu zayo zikhupha kwimingxunya yokuhambisa amanzi) emva koko sibeke imbiza phantsi, ukuya emva kancinci kakhulu siza kubona ukuba isityalo sigoba njani phezulu.
Ucinga ntoni ngalo mbandela?