Q. Which phylum exhibits the cellular level of organisation, with loose cell aggregates and some division of labour?
A) Coelenterata
B) Platyhelminthes
C) Porifera
D) Ctenophora
Explanation
In sponges (Porifera) the cells are arranged as loose aggregates with some division of labour, which is the cellular level. Coelenterates and ctenophores show the tissue level and Platyhelminthes the organ level.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.