Select the incorrect statements from the following : A. In sponges, cells are arranged as loose cell aggregates, exhibiting a cellular level of organisation. B. Radial symmetry is observed in the members of phyla Platyhelminthes and Aschelminthes. C. Annelids, Arthropods, Molluscs and Chordates are coelomate animals. D. Notochord is a mesodermally derived rod-like structure formed on the ventral side during embryonic

Step-by-step solution

Statement A is correct as sponges exhibit a cellular level of organisation with cells arranged as loose aggregates. Statement B is incorrect because members of phyla Platyhelminthes and Aschelminthes exhibit bilateral symmetry, not radial symmetry. Radial symmetry is found in Coelenterates, Ctenophores, and adult Echinoderms. Statement C is correct as Annelids, Arthropods, Molluscs, and Chordates possess a true coelom and are thus coelomate animals. Statement D is incorrect because the notochord is a mesodermally d