An animal has a body plan that is diploblastic, radially symmetrical and lacks a coelom. To which phylum does it likely belong?
A{'text': 'Porifera', 'label': 'A'}
B{'text': 'Coelenterata', 'label': 'B'}
C{'text': 'Platyhelminthes', 'label': 'C'}
D{'text': 'Aschelminthes', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Coelenterata', 'label': 'B'}
1. Diploblastic organisation is found in Coelenterata and Ctenophora only.
2. Both these phyla are radially symmetrical.
3. Coelenterates lack a coelom (they have a gastro-vascular cavity, not a true coelom).
4. So the described animal belongs to Coelenterata (Cnidaria).
_Source: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.1_
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