Question

Biradial symmetry and lack of cnidoblasts are the characteristics of

• A. Starfish and sea anemone
• B. Ctenolana and Beroe
• C. Aurelia and Paramecium
• D. Hydra and starfish

Answer 1

Answer: (B)

Ctenolana and Beroe

Biradial symmetry and lack of cnidoblasts are the characteristics of Ctenoplana and Beroe. They both belong to phylum- Ctenophora. They are called comb-bearers and comb-jellies. The external surface of the body bears eight median comb plates. They are biradial symmetrical animals. Cnidoblasts are absent in the ctenophores.