Question

Which is the characteristic feature of echinoderms?

• A. Smooth skin and radial symmetry
• B. Spiny skin and radial symmetry
• C. Spiny skin and bilateral symmetry
• D. Smooth skin and bilateral symmetry

Answer 1

The correct option is B Spiny skin and radial symmetry

The phylum Echinodermata contains about 6000 species are spiny skinned animals. This phylum exists exclusively in the sea and cannot be found on land or in fresh water. All echinoderms have one thing in common that is radial symmetry although their larval forms show bilateral symmetry that changes in adult stage. Hence, option B is correct.