Q. Which one of the following groups of animals is bilaterally symmetrical and triploblastic?
A) Coelenterates (Cnidarians)
B) Aschelminthes (roundworms)
C) Ctenophores
D) Sponges
Explanation
Aschelminthes are bilateral symmetrical and triploblastic animals, e.g., Ascaris. Coelenterates are radially symmetrical and diploblastic animals, e.g., Obelia. Ctenophores are biradial symmetrical and diploblastic animals, e.g., Ctenoplana. Sponges are asymmetrical or radially symmetrical and diploblastic animals, e.g., Sycon.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.