Echinoderm Symmetry Changes — NEET Biology
✅ Asked in NEET 2026*Echinodermata exhibits radial or bilateral symmetry depending on the stage.
Echinoderms show both radial and bilateral symmetry at different life stages—larvae are bilaterally symmetric, while adults display radial symmetry. NTA tests this because it highlights the unique developmental transition in this phylum, distinguishing them from other animal groups. Students often mistake echinoderms as purely radial or assume symmetry is fixed, missing the developmental angle. Remember: bilateral larvae → radial adults. This concept is tested to evaluate understanding of how body plans change during development and to differentiate echinoderms from cnidarians (which are radially symmetric throughout life) and chordates (bilaterally symmetric throughout).
Select the incorrect statements: A. Digestive system in Platyhelminthes is incomplete. B. Bilateral symmetry is a characteristic of adult Echinoderms. C. Pseudocoelom in Aschelminthes. D. Notochord persists throughout life in Chondrichthyes. E. Reptiles maintain a constant body temperature.
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