Ukukhiqizwa Kwezitshalo
Ukuzala kungenye yezici eziyisisekelo zezinto eziphilayo, okuhlanganisa nezitshalo. Le nqubo ivumela izitshalo ukuthi zikhiqize inzalo, zilondoloze izinhlobo zazo, futhi zisakazekele ezindaweni ezintsha. Izitshalo zinezindlela ezimbili eziyinhloko zokuzala: ezocansi kanye nezingahambisani nocansi, zombili ezidlala indima ebalulekile emjikelezweni wokuphila kanye nokusinda kohlobo. Kulesi sihloko, sizohlola ngokujulile lezi zinhlobo ezimbili zokuzala, izindlela zazo, kanye nezibonelo ezweni lezitshalo.
Ukuzala Ngocansi Ezitshalweni
Ukuzala ngokocansi ezitshalweni kuhilela ukuhlanganiswa kwama-gametes esilisa nabesifazane, okukhiqiza i-zygote ekhula ibe umuntu omusha. Le nqubo yethula ukuhlukahluka kwezakhi zofuzo phakathi kwenzalo, okuzuzisa ukuzivumelanisa nezimo kanye nokuvela kwemvelo.
1. Isakhiwo Sezimbali
Izimbali ziyizitho eziyinhloko zokuzalana kwezitshalo eziningi, ikakhulukazi izitshalo eziqhakazayo (ama-angiosperms). Izakhiwo zezimbali ezidlala indima ekuzaleni zifaka:
– I-Stamen: Isitho sokuzala sesilisa esikhiqiza impova. I-stamen yakhiwa yi-anther, lapho kukhiqizwa khona impova, kanye ne-filament, esekela i-anther.
– I-Pistil: Isitho sokuzala sowesifazane, esakhiwe yi-stigma, lapho impova ifika khona, isitayela, ipayipi elixhumanisa i-stigma ne-ovary, kanye ne-ovary equkethe ama-ovary.
– Imihlobiso yezimbali: Amacembe kanye nama-coroll ezimbali asebenza ukuvikela izakhiwo zokuzala futhi avame ukuheha izinambuzane nezinyoni.
2. Inqubo Yokuvundisa Nokuchumisa
Ukuthuthwa kwempova kuyisinyathelo sokuqala ekuzaleni ngokocansi, lapho impova idluliselwa khona isuka ku-anther iye ku-stigma yembali. Ukuthuthwa kwempova kungaba:
– I-Autogamy: Impova evela embalini efanayo noma kwenye imbali efanayo ifika endaweni engcolile.
– Ukuwela (i-Allogamy): Impova evela komunye umuntu ifika phezu kwenhlamba yomunye umuntu, okukhuthaza ukuhlukahluka kwezakhi zofuzo.
Izinto zemvelo ezibangela ukuvundiswa kwempova zifaka umoya, amanzi, izilwane, futhi ngezinye izikhathi abantu emisebenzini yezolimo.
Ngemva kokuvundisa impova, ukukhulelwa kwenzeka lapho i-gamete yesilisa evela ku-pollen grain ihamba ngesitayela ukuze ifinyelele i-ovary esibelethweni bese ihlangana ne-gamete yesifazane. Le nqubo ikhiqiza i-zygote ezokhula ibe yimbewu futhi ikhule ibe yisitshalo esisha.
3. Izinzuzo Zokuzala Ngocansi
Ukuzala ngokocansi kuvame ukukhiqiza ukwehluka kwezakhi zofuzo phakathi kwenzalo, okungandisa ukumelana nezifo kanye nokuzivumelanisa nezinguquko zemvelo. Lena yindlela eyinhloko yokuthi izinhlobo ziguquke ngokuhamba kwesikhathi.
Ukukhiqizwa Okungenabo Ubulili Ezitshalweni
Ngaphezu kokuzala ngokocansi, izitshalo eziningi zingazalana ngaphandle kocansi, zikhiqize inzalo efana nezakhi zofuzo nabazali bazo. Le ndlela ivame ukushesha futhi ingenzeka ngezindlela ezahlukene:
1. Ukwakheka kwamahlumela (Ukuhluma)
Ihlumela liwukukhula okuncane okuvela esitshalweni esingumzali futhi okungahlukana ukuze kwakheke umuntu omusha. Izibonelo zezitshalo ezizala ngamahlumela zifaka phakathi izihlahla zikabhanana kanye nezinhlobo ezithile zezitshalo zokuhlobisa.
2. UStolon kanye neRhizome
Kwezinye izinhlobo, njenge-strawberry kanye ne-bamboo, ukuzala okungenabo ubulili kwenzeka ngezakhiwo ezikhethekile ezibizwa ngokuthi ama-stolons noma ama-rhizomes. Ama-Stolons ayiziqu ezivundlile ezikhula ngaphezu noma ngaphansi komhlabathi, kanti ama-rhizomes ayiziqu ezingaphansi komhlaba eziqhubeka nokukhula futhi zingakha amahlumela amasha.
3. Ukuxhunyelelwa kanye nokusikwa
Amasu ezolimo njengokufakelwa kanye nokusikwa kuyizindlela zokukhuthaza ukuzala okungenabo ubulili. Ukusikwa kuhilela ukunamathisela ingxenye yesitshalo esisodwa kwesinye, kuyilapho ukusikwa kuhilela ukutshala ucezu lwesiqu, iqabunga, noma impande ukuze kukhiqizwe isitshalo esisha.
4. Ama-Adventist
Ukwakheka kwezitshalo ezintsha ezivela ezingxenyeni zomzimba ezingezona izitho zokuzala ezivamile, isibonelo ukwakheka kwamahlumela avela emaphethelweni amaqabunga esitshalo se-water hyacinth.
Izinzuzo kanye nokungalungi kokuzala okungenabo ucansi
Ukuzala okungenabo ubulili kuvumela izitshalo ukuthi zande ngokushesha ngaphandle kwesidingo sokuvundisa noma ukukhulelwa, okuzuzisayo ezimweni zemvelo ezizinzile. Kodwa-ke, ukuntuleka kokwehluka kwezakhi zofuzo kungenza zibe sengozini enkulu yezifo noma izinguquko ezinkulu zemvelo, njengoba bonke abantu befana ngokwezakhi zofuzo.
Isiphetho
Ukuzala ezitshalweni kuyinto eyinkimbinkimbi futhi ethakazelisayo evumela izinhlobo ezahlukene ukuba ziphile futhi zivumelane nezindawo zokuhlala ezahlukahlukene. Kokubili ukuzala ngokocansi kanye nokuzala okungenazo izitho zobulili kunezinzuzo kanye nokungalungi, okwenzelwe isu lokusinda kwesitshalo kanye nezimo zemvelo esibhekene nazo. Ukuqonda okujulile ngalezi zinqubo akugcini nje ngokusiza ukulondolozwa kanye nezolimo kodwa futhi kunegalelo ekuqondeni kwethu ukuhlukahluka kokuphila emhlabeni wethu. Kulesi sikhathi sokushintsha kwesimo sezulu okusheshayo, amasu okuzala izitshalo anganikeza ukuqonda okubalulekile ngokuzivumelanisa nezimo kanye nokuqina kwezindawo zemvelo esithembele kuzo.
