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| 1. |
Define echinodarmata ?with figure |
| Answer» Phylum Echinodermata (spiny skinned animals)Main Features are as follows:(i)\xa0They are marine and free living.(ii)\xa0They are triploblastic, and have a coelomic cavity.(iii)\xa0Body surface is covered all over by spines\xa0(iv)\xa0Body cavity is modified into a water-vascular system and has a peculiar water-driven tube system which is connected tubefeet for locomotion.(v)\xa0Sexes are separate.(vi) They have hard calcareous structures that is used as a skeleton.\xa0Examples. Asterias (star fish), Echinus (sea urchin), Antedon (feather star) etc.A Antedon\xa0B. HolothuriaC. StarfishD. OphiodermaE. Echinus | |