NEET · Biology · STD 11 - 4. Animal kingdom

Radial symmetry is NOT found in adults of phylum

A Echinodermata
B Ctenophora
C Hemichordata
D Coelenterata

Verified Solution

Answer & Solution

Correct Answer

(C) Hemichordata

Step-by-step Solution

Detailed explanation

Option (3) is the correct answer because hemichrodates are bilaterally symmetrical animals.
Option (4) is not the answer because coelenterates are radially symmetrical organisms.
Option (1) is not the answer because adult echinoderms are radially symmetrical in adult stage
Option (2) is not the answer because ctenophores are radially symmetrical organisms.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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