Answer: Acoelomate, pseudocoelomate, coelomate.
- A Coelomate, pseudocoelomate, acoelomate
- B Acoelomate, pseudocoelomate, coelomate
- C Pseudocoelomate, coelomate, acoelomate
- D Coelomate, acoelomate, pseudocoelomate
Correct answer: B. Acoelomate, pseudocoelomate, coelomate
Explanation: Acoelomates (e.g., Platyhelminthes) have no body cavity, pseudocoelomates (e.g., Nematoda) have a body cavity not fully lined by mesoderm, and coelomates (e.g., Annelida, Arthropoda, Chordata) have a true coelom completely lined by mesoderm.
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.