Question

write a short note on echinoderms

Answer 1

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Echinoderms are invertebrate marine animals that are found in all oceans of the world and at all depths. There are no echinoderms in freshwater environments.

Members of the Phylum Echinodermata include many easily recognizable creatures such as sea stars (or starfish), brittle stars, sea urchins, sea cucumbers, and sea lilies. All of these animals are radially or biradially symmetric, and they fill a variety of niches in marine environments as particle feeders, browsers, scavengers, and predators.


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Answer 2

An echinoderm is a member of the phylum Echinodermatawhich contains a number of marine organisms recognized by their pentamerous radial symmetry, calcareous endoskeleton, and a water vascular system which helps operate their small podia. Podia are small extensions of flesh which are operated by water pressure and muscles, and controlled by the nervous system of the echinoderm. The calcareous endoskeleton is made of many small plates that overlap under the skin, forming an armor and a structural form for the organisms. Examples of an echinoderm include a starfish, a sand dollar, a brittle star, a sea urchin, and a sea cucumber. There are around 7,000 echinoderm species, and they can range from less than an inch to over three feet in diameter.