Polyp Hydra - ib tug tsawg glutton

Hydra - yog ib tug tshwj xeeb tsev neeg, ib tug tswv cuab ntawm lub chav kawm ntawv ntawm hydroids hom coelenterates. Lawv ua neej nyob tsuas nyob rau hauv dej tsis qab ntsev, mas nruj nrog duckweed. Lawv xav kom kho nyob rau hauv lub brightest qhov chaw ntawm pas dej thiab marshes, raws li zoo li tshav ntuj. Lawv pub on dej dev mub, me me yoov tshaj cum kab, kib, cyclops, vodoemnym plankton.

Polyp Hydra yog zoo nyob rau hauv loj mus rau ib tug grain ntawm barley. Nws translucent, grayish Hawj txawm. Nyob rau hauv ib tes nws muaj ib lub qhov, uas ua raws li cov kab noj hniav thiab npaj mus rau extract cov khoom pov tseg puag ncig tentacles. Nyob rau lwm cov tes yog ib tug thiaj li hu ua ib uas nws sticks mus rau lub chaw dej saum npoo.

Lub cev muaj ob cell hom - sab nraud thiab sab hauv. Tag nrho cov sab hauv - nws yog ib lub plab hnyuv kab noj hniav. Ua pa yog nqa thoob plaws hauv lub cev nto.

Los ntawm adopting ib tug ruaj khov txoj hauj lwm, dej tsis qab ntsev Hydra freezes nyob rau hauv anticipation ntawm tus neeg. Nyob rau tentacles yog me me cilia uas pab kom paub tias cov nce prey. Nyob rau Hydra lub cev nto mus rau ib tug ntau dua raws li nyob rau hauv lub tentacles, muaj hlwb nrog ib tug plaub hau projecting muaj tshuaj ntsiav tshuaj lom. Nyob rau hauv kev sib cuag nrog zus tau tej cov xws li ib tug ntawm tes, txais tshuaj lom tua nws. Hydra tentacles pushes prey rau lub qhov ncauj thiab nqos nws.

Polyp Hydra - ib tug tiag tiag glutton. Nws yog tau noj tus nqi ntawm cov khoom noj khoom haus peb lub sij hawm ntau tshaj nws tus kheej. Nqos khoom noj khoom haus mus ncaj qha mus rau hauv lub plab hnyuv lumen, uas yog nqis sai sai.

Yog hais tias ib tug tsuas thov ob tug ntawm cov Hydra, lawv yuav pib nqus txi rau ob sab. Thaum hu loj, ib tug muaj zog nqos me me thiab. Tab sis lub paradox, nqos Hydra tsis tuag. Tom qab ib co sij hawm nws Dentistry los ntawm lub siab tawv yuav nqos. Tau nyob rau hauv lub plab hnyuv lumen kinsman, "otryahnuvshis", nws pom ib tug qhov chaw, nrog thiab freezes nyob rau hauv anticipation ntawm khoom noj khoom haus.

Hydra dej tsis qab ntsev yuav muab ob txoj kev: budding (asexual) thiab faib lub (kev sib deev). Nyob rau hauv thawj txoj kev ua ib tug los yog ntau tshaj growths rau ntawm nws lub cev, uas, thaum paub tab, yog cais los ntawm lub "niam." Rau ib lub hlis rau hauv lub Hydra yuav tau ua kom mus txog rau 15 hom ntawm lawv tus kheej zoo. Qhov no yooj yim txoj kev yog heev tsim vim hais tias feem ntau ntawm cov me nyuam ces tau, cawm.

Qhov thib ob embodiment siv hais tawm nyob rau hauv cov ntaub ntawv ntawm shortage ntawm cov khoom noj khoom haus. Nyob rau hauv malnutrition tej yam kev mob yog tus tsim ntawm tus kab hlwb. Thiab nyob rau tej lub nrws txiv neej hlwb yog tsim, thiab nyob rau lwm yam - cov poj niam. Tom qab fertilization, lub qe yog tsim nyob rau, thaum ib tug neeg laus neeg tuag, thiab lub resulting qe dab dej mus rau hauv qab. Tom qab dag rau tej lub sij hawm, vim hais tias nws muaj peev xwm yuav tsim nyob rau hauv lub caij nplooj ntoos hlav ntawm lub Hydra, tab sis ntau zaus nws tuag.

Tej me nyuam dej polyp Hydra feem ntau ntawm lawv lub neej tseem. Yog hais tias tsim nyog, tej zaum nws yuav tawm mus, mus thiab dabtsi yog khoov rau hauv lub cev tib tug. Nrhiav ib lub tsev tshiab, nws sucked.

Polyp Hydra muaj ib tug high muaj peev xwm kom zoo rau cov poob lossis puas cev (regenerated). Thaum phais ntawm ib tug neeg mus rau hauv ob qhov chaw, txawm tsis zoo tib, ua ob Hydra. Zaum tau qhia tias Hydra raws immortal.