1. Nezmar Hnědý

2. listopadu 2008 v 11:56 | Klára |  Žahavci

1. Nezmar hnědý

Říše:živočichové (Animalia)
Kmen:žahavci (Cnidaria)
Třída:polypovci (Hydrozoa)
Řád:nezmaři (Hydroida)
Čeleď:nezmarovití (Hydridae)
Rod:nezmar (Hydra)
Binomické jméno:Hydra oligactis




•žije přisedle- jejich polypy jsou přisedlé na kamenech či vodních rostlinách.




•mají cca 6 ramen.
•Rozmnožování: pohlavní- Nezmar je Hermafrodit. Hermafroditi mají ženský orgán i mužský orgán.
• Postup- nezmar vypustí vajíčko i spermii, ty se potkají, spadnou. Začnou mu růst ramena jeho polypy přisednou a je nový nezmar.
•nepohlavní- nemzarovi se na těle udělá ,,pupen". V něm je plod. Až se v něm nahromadí dostatečně buněk, jednoduše se odškrtí. Jeho polypy též přisednou na kámen či rostlinu, začnou mu růst ramena a je nový nezmar.
•Příjem potravy- Má trávící dutinu která se nazývá láčka. Nezmar má v ramenech žahavé buňky, kterými omráčí potravu. Dá si jí ramenama do ,,úst". v těle ji stráví. Látky, které nestráví jednoduše vyplivne zpět do vody.

Jestli máte nějaké dotazy, pište do komentů. :) Klára

zdroj: biologie-online.blog.cz
 

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