Question

Which one occurs in echinodermata?

• A. bilateral symmetry
• B. radial symmetry
• C. porous body
• D. soft skin.

Answer 1

The Correct Option is B

Echinodermata is a phylum of marine animals that is characterized by a unique form of symmetry. Let's analyze each option provided to identify which feature occurs in Echinodermata:

• Bilateral Symmetry: This type of symmetry is where the body can be divided into identical halves along a single plane. It is not typical of adult echinoderms, though echinoderm larvae may exhibit bilateral symmetry.
• Radial Symmetry: Echinoderms, as adults, exhibit radial symmetry, where their body structure is arranged around a central axis. This allows them to interact with the environment equally from all sides. Therefore, this is the correct characteristic for Echinodermata.
• Porous Body: A porous body is a characteristic of sponges (Phylum Porifera) and not echinoderms.
• Soft Skin: Echinoderms typically have a hard, calcareous endoskeleton, which is covered by a thin layer of skin. Therefore, they do not have soft skin as a distinctive feature.

Conclusion: The correct answer is radial symmetry, as echinoderms exhibit this symmetry in their adult form. This feature allows them to adapt to their marine environment effectively.