- A Porifera, exhibiting bilateral body symmetry overall
- B Echinodermata adults, radial symmetry
- C Annelida, exhibiting radial body symmetry overall
- D Platyhelminthes, lacking any defined body symmetry
Correct answer: B. Echinodermata adults, radial symmetry
Explanation: Echinodermata show radial symmetry as adults but bilateral symmetry as larvae. Porifera is generally asymmetrical, and Annelida and Platyhelminthes show bilateral symmetry.
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.