Question

Echinoderms show which of the following characteristics?

• A. Smooth skin and Radial symmetry
• B. Spiny skin and Bilateral symmetry
• C. Spiny skin and Radial symmetry
• D. Spiny skin and Asymmetry

Answer 1

The correct option is C Spiny skin and Radial symmetry

Some of the characteristics of Echinodermata are as follows.

• Free-living exclusively marine forms.
• Adults are radially symmetrical while larvae are bilaterally symmetrical.
• The body is represented by a central disc covered by ossicles with spines called pedicellaria.
• The digestive system is complete.
• A unique water vascular system is present.
• Tube feet are present for locomotion and respiration.
• The nervous system has a central nerve ring with five radiating nerves.
  
• Reproduction is sexual.
• Sexes are separate.
• Development is indirect.