An animal is described as triploblastic, bilaterally symmetrical, coelomate and metamerically segmented. It most likely belongs to phylum
A{'text': 'Platyhelminthes', 'label': 'A'}
B{'text': 'Annelida', 'label': 'B'}
C{'text': 'Aschelminthes', 'label': 'C'}
D{'text': 'Coelenterata', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Annelida', 'label': 'B'}
1. Triploblastic + bilateral symmetry rules out Coelenterata (which is diploblastic + radial).
2. Being coelomate rules out Platyhelminthes (acoelomate) and Aschelminthes (pseudocoelomate).
3. Metameric segmentation is diagnostic of Annelida.
4. So the described animal fits Annelida (e.g., Pheretima, Nereis).
_Source: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.2.6_
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