Yini isithelo: ukukhiqizwa kabusha okuzala, zisakaza kanye nokudla

Ngamunye kunoma isiphi isigaba ephilayo ophilayo wenza umsebenzi zawo ezibalulekile. Qonda lunye yabo kuyosisiza anatomy izimbali izitshalo. Isithelo akulona sokugcina kulolu chungechunge.

izitho okuzala

Zonke izingxenye zalesi sihlahla zingahlukaniswa ngamaqembu amabili. Ngu vegetative zihlanganisa impande, ekunqandeni kanye leaf. indima yabo ibalulekile. Lokhu ukugeleza kwamanzi, amaminerali umsoco, zamagama izinto eziningi eziphilayo, esiphelweni vegetative. izitho okuzala (imbali, izithelo, imbewu) zenzelwe ukwenza njenge kabusha eziphilayo.

Yini isithelo isitshalo? Ukuze siphendule lo mbuzo, omunye kufanele siqonde kuqala ukuthi kwaqala. Kumiswa izithelo ezivela ezingxenyeni ezithile imbali kuphela: kusukela elivundisiwe gamete zesifazane - embryo yoke, kusukela maphakathi - elingasebenzi izakhi endosperm. Zonke ndawonye ke - imbewu. Kodwa ukuhluma futhi nokuthuthukiswa ikusasa umzimba ezincane kudinga isivikelo futhi nokudla okuthe xaxa. Lokhu indima ebalulekile inikezwa kuya pericarp, ehlanganisa izingqimba eziningana: elingaphandle, maphakathi kanye kwangaphakathi. Ngamunye wabo has izici zayo siqu, ngenxa nemisebenzi eyenziwa.

Yini isithelo

Ngu isakhiwo izithelo ezomile kanye namanzi, futhi PIP polyspermous. Kodwa, kungakhathaliseki ukuthi izici, ngamunye yayo "anakekele 'imbewu yabo, enza imisebenzi ebalulekile.

imbewu zisakaza

Yini i-fetus - angabhekwa hhayi kuphela ngombono abe isivikelo, kodwa futhi basakaze imbewu. Lokhu kubaluleke kakhulu ngenxa Izindawo izitshalo kuyo yonke indawo, okwandisa yohlobo lwazo ukwehluka.

Izindlela imbewu zisakaza kuyehluka kantsi kunebugagu kuxhomeke ikakhulukazi sikebhe isakhiwo. Ngokwesibonelo, owaziwa elimnyama ikhukhamba ngokwayo uyahlakaza imbewu, breaking ngokusebenzisa uqweqwe obunesikhumba. Ngokufanayo, ngesikhathi touch aqhephukile izithelo ebhalsamu.

umlingani esinokwethenjelwa ukusatshalaliswa izitshalo ukuthola umoya. Impellers maple nomlotha abelethwe kalula up by ukugeleza komoya futhi baqhubeka amabanga ngokwanele kude. Ngokuvamile iningi Iconsi izithelo ezomisiwe kusakazeka imbewu ngakho.

Abaningi asemaqeleni izitshalo zihlume uDries ezansi, ephula off futhi ayephatha ngumoya. Njengoba uhamba yonkana asemaqeleni eyindilinga ehlathini tumbleweed.

Prickly, baqinile futhi bayaphikelela burdock izithelo Ngokuvamile kuye kudingeke Dabula izingubo zokugqoka noma isilwane izinwele. Lena lithathelwe Izindawo zabo. Phela, ukuthola yena iva singaba amabanga amade uma liya endaweni lokunamathelisa.

ezimila emanzini kusakazeka imbewu olwandle.

Nokho, izithelo namanzi nge pericarp elikhanyayo ibikade ifinyeleleka uju ozithandayo abantu nje kuphela, kodwa izinyoni nezilwane eziningi. Kanye izinsalela undigested imbewu ukudla enhlabathini kude kwesihlahla umzali.

Ukuvikela imbewu

Izithelo like ikhaya eliphephile, ukusiza imbewu ukusinda kwezimo zendawo ezimbi. Futhi lapho kuqala ukushisa futhi kukhona ngokwanele solar energy - uhlume, ngokunikela ngokuphila nesitshalo ezintsha.

Yiqiniso, akubona bonke izingxenye izitshalo esihlwabusayo ezidliwayo. Ngokwesibonelo, yini umsebenzi isithelo nut? odrevesnevevshaya yakhe igobolondo lisusiwe ukudla, kuyinto izimfanelo hhayi eyigugu yokudla okunempilo. Kodwa leso sivikelo ocebile ziyadliwa imbewu amafutha ngaphandle nobunzima bayolala ezweni ekwindla nasebusika. Thombo ngeke zisenza sibe hazel esizayo.

Amnandi Futhi okunempilo

Kodwa iningi lethu ukuhlobanisa izithelo nge imikhiqizo esihlwabusayo futhi unempilo ukuthi babe isicelo ebanzi. Man elondoloza izithelo kanye amajikijolo, ukhukhamba nemifino, igedle futhi unezela imbewu kunonga ezihlukahlukene izitsha njengendlela isithokelo. Kusukela izithelo nokusanhlamvu ekhiqizwa ufulawa, ngaphandle okuyinto akunakwenzeka ukuba abhake izinkwa. Of izithelo ezomisiwe zommbila, ubhekilanga, sayinela ukungena, yefilakisi ngawakhamela inqwaba amafutha ezibalulekile.

Izithelo kanye imbewu zisetshenziswa kulezo zimboni. Zikakotini silwenza izindwangu zemvelo, okuvumela ukuba uzizwa ukhululekile ngisho ukushisa babulawa.

Futhi esikhathini imikhuhlane, ngaphandle strawberry, ama-raspberry kanye viburnum abanakukwazi ukwenza. Ziyakwazi uvithamini C, ukusekela omzimba omuntu.

Emvelweni kakhulu futhi izithelo ezinobuthi. Henbane izimbangela ukuhlanza nesiyezi, umdala - uhudo, shishkoyagody yew - kokunikezwa kwe-izinhlelo eziphathelene nenhliziyo zokuphefumula. Lesi sitshalo igwababa amehlo ezinesihlungu zonke izingxenye. I amajikijolo ngokwesiko ayingozi kakhulu, ngoba bethatha izinto ngokungathí ukubukeka ekhangayo. Isikhathi esining impela ukukuxoxela izingane zakhe. Kodwa ukwenza lokho kunoma isiphi isimo akunakwenzeka, ngoba kungaba kuholele ngisho nasezinkingeni ukuboshwa inhliziyo.

Sibheka ukuthi yini umsebenzi we-fetus njengoba isitho okuzala ka simila. Kufeza indima ebalulekile i-umzimba, ukuze ixazululwe futhi isilwane yayo lokudla. Kodwa ngaphezu kwakho konke lisebenzisa umuntu ngokudla izithelo lonke nezingxenye remanufactured.