Q. Biradial symmetry and lack of cnidoblasts are the characteristics of :
A) Starfish and sea anemone
B) Ctenoplana and Beroe
C) Aurelia and Paramecium
D) Hydra and starfish
Explanation
[Solution from source] Ctenophores such as Ctenoplana and Beroe have biradial symmetry and lack cnidoblasts, using colloblasts to catch prey instead. Hydra, sea anemone and Aurelia are cnidarians with cnidoblasts. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.