Kuswana njoka

Kale, njoka zinkaonedwa osati chizindikiro cha chinyengo ndi choipa, komanso mbali ina ya nzeru ndi mphamvu zazikulu. Komabe, ali ndi chinthu chimodzi chofanana - chinsinsi. Mpaka pano, munthu sanathe kudziwa zonse zokhudza moyo wake.

Pali mitundu ya njoka yomwe imagawika m'magulu awiri, yaimuna ndi yaikazi, komanso palinso njoka zamitundu yonse nthawi imodzi. Ndiko kuti, njoka ndi hermaphrodites. Ma Hermaphrodite ali ndi ziwalo zonse zogonana, amuna ndi akazi. Mitundu iyi imatchedwa Island botrops, amakhala ku South America, pachilumba cha Kaimada Grande. Chochititsa chidwi n'chakuti, mtundu uwu wa njoka umangokhala mbali iyi ya dziko lapansi, ambiri mwa iwo ndi hermaphrodite, ngakhale kuti amuna ndi akazi amapezeka. Ndizosangalatsanso kudziwa kuti yaikazi imatha kuyikira mazira ndi makayi popanda kutengapo gawo lamphongo, ndiko kuti, kuyikira mazira osabereka. Kubereka kwamtunduwu kumatchedwa parthenogenesis.

Izi ndizotalikirana ndi mfundo zonse zokhuza kuswana njoka. Mitundu ina yambiri ya njoka siziikira mazira konse. Ana awo amabadwa viviparous, ndiko kuti, okonzeka kale kuti akakule ndi thupi. Pambuyo pa kubadwa, amatha kudzidyetsa nthawi yomweyo ndikupeza njira yobisala kwa adani.

Palinso njira yachitatu yoberekera ana a njoka - ovoviviparity. Iyi ndi njira yomwe ili yapadera mwa njira yakeyake. Miluzayo imadya zakudya zimene zili m’mazirawo, ndipo mazirawo amakhala m’njokayo mpaka anawo atakula ndi kuyamba kuswa.

Ndi anthu ochepa poyang'ana koyamba ndi maso amaliseche amatha kudziwa kuti njoka ndi yani. Njoka zazimuna zimasiyana ndi mbalame zazimuna komanso mitundu yambiri ya nyama chifukwa ndi yaying'ono kuposa zazikazi, koma mchira wawo ndi wautali kwambiri kuposa wa zazikazi.

Koma chochititsa chidwi kwambiri n’chakuti mitundu yambiri ya akazi imatha kusunga ubwamuna wamoyo m’kati mwawo kwa nthawi yaitali ukangokwerera kamodzi. Panthaŵi imodzimodziyo, mwa njira imeneyi amatha kubereka ana kangapo, akumalumikizidwa ndi umuna umenewu.

Njokazo zikadzuka pambuyo pogona nthawi yaitali m’nyengo yozizira, nyengo yokwerera imayamba. Pali zamoyo zomwe zimakwatirana m'magulu akuluakulu, zomwe zimasonkhana m'mipira ndikuyimba mluzu panthawiyi. Anthu omwe sadziwa kalikonse za khalidwe la njoka amatha kuopseza kwambiri, koma njoka siziyenera kuphedwa, panthawiyi palibe ngozi kwa anthu. Mfumu cobra imasonkhanitsa amuna angapo mozungulira iye, omwe amalukidwa kukhala mipira, koma, pamapeto pake, mwamuna mmodzi yekha ndi amene angadyetse mkaziyo. Njirayi imatha masiku 3-4, kenako yaimuna yomwe yaimitsa yaikazi imabisa chinthu chomwe chimalepheretsa amuna ena kuchita chimodzimodzi. Kanthu kameneka kamapanga pulagi m’maliseche a njoka, motero amalepheretsa madzimadzi aamuna kuthawa komanso kulepheretsa amuna ena kulowamo.