AIIMS 2019 Zoology Phylum Coelenterata MCQ Question

Free swimming, radially symmetrical animals with cnidocytes are characteristic of the phylum Coelenterata, which includes organisms such as jellyfish and corals. Cnidocytes are specialized cells that contain stinging structures called nematocysts, used for capturing prey and defense. In contrast, Platyhelminthes (flatworms) lack true radial symmetry and cnidocytes, Ctenophora (comb jellies) possess a different type of cell for capturing prey, and Echinodermata (e.g., starfish) exhibit bilateral symmetry in their larval stage and have a unique water vascular system, not cnidocytes.