Answer: Metameric segmentation of the body.
- A Open circulatory system in both
- B Metameric segmentation of the body
- C Absence of a coelom
- D Exoskeleton made of chitin in both
Correct answer: B. Metameric segmentation of the body
Explanation: Both Annelida and Arthropoda show metameric segmentation (repetition of body segments), though Annelida has a closed circulatory system while Arthropoda has an open one, and only Arthropoda has a chitinous exoskeleton.
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.