Comparative yam ntxwv ntawm cov dej tsis qab ntsev Hydra thiab dawb planarian: nta ntawm lub koom haum

Comparative yam ntxwv ntawm cov dej tsis qab ntsev Hydra thiab dawb planarian muab ib tug ntshiab lub tswv yim txog cov yam ntxwv ntawm lub koom haum thiab kev loj hlob ntawm ob lub hom multicellular cov tsiaj - coelenterates thiab flatworms. Nyob rau hauv no tsab xov xwm peb yuav saib qhov no qhov teeb meem los ntawm lub foundations ntawm complexity nta ntawm lawv cov qauv.

vaj tse

Nyob rau qhov no qhov teeb meem, lub comparative cov yam ntxwv ntawm dej tsis qab ntsev Hydra thiab dawb planarian zoo sib xws. Tus thawj tsiaj tau txais nws lub npe raws li nyob rau hauv lub vaj tse. Txawm tias nws muaj ntau yam lwm yam kev hom nyob rau hauv lub seas. Planaria kuj prefers me me dej tshiab, qhov chaw uas nws hides nyob rau hauv lub pob zeb thiab Driftwood.

txoj kev ntawm lub neej

Hom ntawm dej tsis qab ntsev Hydra - ib zaug xwb polyp. Rau underwater khoom nws fastens puag nws kav - ib, uas ua raws li ib tug sucker. Thaum lub opposite kawg ntawm lub cev yog Hydra tentacles. Nrog lawv pab tus tsiaj grabs, tuav ntau lawm thiab coj nws mus rau hauv lub qhov ncauj. Vim muaj cov tshwj xeeb daim tawv nqaij-mob hlwb, lub Hydra yuav hlob thiab khoov. Nyob rau hauv sib piv rau lub dej tsis qab ntsev polyp Planaria ua sedentary lub neej.

Muaj ntau cov neeg sawv cev ntawm coelenterates thiab flatworms yog txawv kiag li txoj kev ua neej. Piv txwv li, lub siab fluke thiab tapeworm dav, uas yog cab cua nab muab lawv tus kheej mus rau lub ducts ntawm lub hauv nruab nrog cev ntawm lub fwjchim luj kawg nkaus.

hom ntawm cov zaub mov

Comparative yam ntxwv ntawm cov dej tsis qab ntsev Hydra thiab dawb planarian yog tsis yooj yim sua yam uas tsis tau xav tias yuav lub hom zaub mov. Nyob rau hauv cov teeb meem no ntau heev yuav ua nyob rau hauv cov kab mob. Planaria thiab Hydra - heterotrophic kab mob. Ob leeg uas yog ua npua. Hydra plob hav zoov siv stinging hlwb uas ua kom xiam hoob khab prey.

Planaria kuj noj me me dej tsiaj. Kev ntes thiab sau cov kev txi nws pab cov epithelial hlwb, uas swell nyob rau hauv cov dej. Cov kabmob ntawm lub digestive system yog planarians qhov ncauj kab noj hniav thiab cov hnyuv. Cov yav tas muaj ib tug pem hauv ntej thiab nruab nrab chaw ua hauj lwm, uas xaus blindly.

Avilable dawb planarians thiab Hydra

Hydra muaj ib tug radial symmetry. Nws lub cev yog tsim los ntawm ob tug khaubncaws sab nraud povtseg - ecto- thiab endoderm. Nws yog li ntawm ntau hom ntawm tshwj xeeb hlwb: digestive, deev, epithelial-npag, ntxais ntxais, glandular, digestive, lub paj hlwb. Lawv ua li khiav ri thoob plaws hauv lub cev thiab tsis tsim ib tug polyp cov ntaub so ntswg.

Dawb Planaria, uas yog tus neeg sawv cev ntawm lub hom flatworms, muaj ib tug yus lub cev zoo lawm. Nws flattened nyob rau hauv dorsoventrally thiab tsa ib tug me me nplooj. Qhov no tsiaj nrog ob sab sib dho symmetry. Nyob rau hauv planarians tshwm sim tiag tiag ntaub so ntswg, nruab nrog cev thiab tshuab. Qhov no licas, digestive, excretory, lub paj hlwb, kev ua me nyuam. Ib tug ntau feature ntawm cov tsiaj yog cov theem siab ntawm lwm. Yog li, Hydra yuav rov qab tau los ntawm ib tug slurry zoo li lub xeev, thiab planaria muaj peev xwm ntawm vegetative hais tawm.

Comparative yam ntxwv ntawm cov dej tsis qab ntsev Hydra thiab dawb planarian qhia tau hais tias ib tug tseem ceeb nce nyob rau hauv cov theem ntawm lub koom haum ntawm flatworms. Coelenterates, nrog rau lub paj rwb yog thawj multicellular prelstavitelyami fauna. Txawm li cas los, cov fabrics tau muaj. Qhov no qauv tsuas pom nyob rau hauv flatworms. Yog li ntawd, lawv cov qauv thiab muaj peev xwm mus nyob yog yus muaj los ntawm ib tug siab dua theem. Txheej thaum ub nta ntawm lawv cov qauv no yog cov tsis tuaj kawm ntawv ntawm cov pa thiab circulatory system. Yog li ntawd, nkev pauv nyob rau hauv flatworms los ntawm lub cev nto.