Question

define the term echinodermata
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Answer 1

Answer:

a phylum of marine invertebrates which includes starfishes, sea urchins, brittlestars, crinoids, and sea cucumbers. They have fivefold radial symmetry, a calcareous skeleton, and tube feet operated by fluid pressure.

Answer 2

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Characteristic of phylum Echinodermata -

• Echinodermata is made up of echinos - spines; derma - skin; ata - group.

• Echinoderms are marine animals.

• They are gregarious and benthonic.

• Locomotion occurs by tube feet or podia.

• The body of echinoderms are covered by a spiny exoskeleton.

• Echinoderms have organ system organisation, pentamerous radical symmetry and trey coelom.

• Echinoderms are star like or elongated in their shapes.

• Their development includes a bilaterally symmetrical larva.

• There sexes are always unisexual.

• Echinoderms have high power to develop their lost parts.

• Their Endoskeleton is made up of calcium carbonate called calcareous.

• Star fish, brittle stars, sea lilies, sea cucumber and sea urchins are the examples of echinoderms.