Answer: Mollusca.
- A Echinodermata
- B Mollusca
- C Arthropoda
- D Hemichordata
Correct answer: B. Mollusca
Explanation: Octopus and Pila are both members of phylum Mollusca, characterized by a soft body with a head, visceral hump, and muscular foot.
Moving across the animal phyla, body organisation becomes progressively more complex: from no symmetry and cellular organisation (Porifera) through radial/diploblastic (Cnidaria), bilateral/acoelomate (Platyhelminthes), pseudocoelomate (Nematoda), to a true coelom with full organ systems (Annelida and beyond).
Concept context
Phylum-level classification of the animal kingdom from Porifera to Chordata, based on body symmetry, coelom, and segmentation. One of the most example-heavy chapters for NEET.