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Solution


Q.

Select the taxon mentioned that represents both marine and fresh water species.          [2014]
1 Echinoderms  
2 Ctenophora  
3 Cephalochordata  
4 Cnidaria  

Ans.

(4)

Cnidarians are the sac-like animals which are aquatic, mostly marine except a few like Hydra, are fresh water forms. They are the simplest organisms that have attained a tissue level of organization. Members of Ctenophora, Cephalochordata and Echinodermata are exclusively marine.