KumiswaIsayensi

Kuyini umbungu kwezilwane kanye wezitshalo

Kuyini umbungu? Leli gama kungenzeka kwezilwane ezesayensi yezitshalo kanye. Manje okuncane mayelana ngamunye.

kwezilwane

Kule ngxenye libhekisela umbungu umbungu. Kuyini umbungu? Ake sicabangele isibonelo inkukhu neqanda. Kanjani ukuqala ukuthuthukiswa umbungu? Njengoba kokukhulelwa. Kulokhu, isikhuphasha engena oviduct. Ngaphezu kwalokho, ngemva kwamahora angu-amabili, lapho egqoke konke egg shell kwakheka ngaphakathi-embryo yoke, inkukhu, uyakuwufeza.

Qaphela ukuthi ukuze abonise inkukhu, kubalulekile ukuba silondoloze amaqanda njalo (degrees amane) lokushisa. Umbungu uyaphila hhayi ningi than amasonto amathathu, uma phakathi nalesi sikhathi inkukhu kuyibululu, umbungu uyafa. Indlela silondoloze lokushisa oyifunayo? Ukuze wenze lokhu, zikhona amadivaysi bokuzenzela noma yena inkukhu hen ezokwenza efukamela amaqanda kuze kufike inzalo kuzalwa.

wezitshalo

Kuyini "umbungu 'e wezitshalo? Njengoba e kwezilwane, kungase ngokuthi umbungu ukuthi wasuka nokuhlanganiswa gametes ezimbili (esilisa esifazane) e ukuzala. Ngo izitshalo ephakeme, i-embryo ibizwa ngokuthi igciwane of sporophyte asexual.

isakhiwo

Ngakho, liyini nombungu isitshalo, ukuqonda manje okuncane mayelana isakhiwo. It liqukethe izingxenye eziningana:

  • Emgogodleni, kusuka okuzobe kamuva ukuthuthukisa impande main.
  • stem embryonic - nje ingxenye isitshalo ukuthi sibona phezu lokuqala inhlabathi phakathi ukuhluma kwezinhlobo imbewu.
  • Sezinso, kusukela lapho kukhona ukuphunyuka.
  • Cotyledon - amaqabunga yokuqala izitshalo ukuthi sebeqala ukuthuthukiswa yabo namanje e imbewu. Njengomthetho, lezi amahlamvu azisafani ukuthi kuzoba isitshalo omdala. Lapho lo mehluko zingatholakala akuzange kuhlonishwe kuphela indlela futhi isakhiwo, kodwa futhi umsebenzi.

Njengoba kwenzeka imbewu ukuhluma

Ukuhluma engavumelekile itholakala kuphela uma izimo ezithile siyithola. Ukuze ukuthuthukiswa umzimba kumele kube isamba elanele ukushisa, ukukhanya nomswakama. Ngenxa yomsebenzi we-plant cells esizayo bacale kutfutfukisa izitho ezinkulu namanje imbewu. Impande lokuqala sengathi kuvikela imbewu enhlabathini. Khona-ke eba Isiqu, ngemva kwalokho uqala cotyledons ukuthuthukiswa. Uma izinyathelo zangaphambilini zonke izitshalo zenzeka ngokulinganayo, ukuthuthukiswa kwe-cotyledons konke ezahlukene. Abakwazi ukuhlala ngaphansi emhlabathini futhi bakhonze njengamaphayona nokunonophala izakhi, futhi kungenzeka alethwe ebusweni kanye Isiqu futhi yenza njenge amahlamvu kuqala, ukuthi waziphatha-photosynthesis.

Ngemva kwalokho, baqala ukuthuthukisa amahlamvu basal, impande zazo, kanye nazo zonke amagatsha yakha uhlelo impande. Ukuba interstices kanye izimpande adventitious.

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