Q. Which phylum is exclusively marine, radially symmetrical, diploblastic and bears eight external rows of ciliated comb plates?
A) Coelenterata
B) Echinodermata
C) Porifera
D) Ctenophora
Explanation
Ctenophores (sea walnuts or comb jellies) have eight rows of ciliated comb plates for locomotion, show well-marked bioluminescence and reproduce only sexually.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.