Question

Explain Phylum Echinodermata

Answer 1

Echinoderms are characterized by radial symmetry, several arms (5 or more, mostly grouped 2 left - 1 middle - 2 right) radiating from a central body (= pentamerous).

The body actually consists of five equal segments, each containing a duplicate set of various internal organs.

Answer 2

Answer:

1. They are exclusively marine.

2. Have radial symmetry.

3. Are eucoelomate(true body cavity) and triploblastic(three germ layers present).

4. Spiny skinned.

5. Water vascular system that is tube feets are present.

6. Endoskeleton is made up of calcium carbonate.

7.They lack head.

8. Sexes are separate.

9. Eg-sea star(asterias),feather star(antedon)

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