A : Echinoderms are the only radially symmetrical animals with tr…

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MCQ

$A$ : Echinoderms are the only radially symmetrical animals with true coelom.

$R$ : Echinoderms have secondarily adapted to radial symmetry.

A
Assertion and Reason both are correct and also correct explanation.
✓
Assertion and Reason both are correct but not explanation of assertion.
C
Assertion is correct, but Reason is incorrect.
D
Both Assertion and Reason are incorrect.

✓

Answer

Correct option: B.

Assertion and Reason both are correct but not explanation of assertion.

b
Assertion is true, Echinoderms are only radially symmetrical animals with true coelom.
Reason is also true as echinoderms have secondarily adapted to radial symmetry, because larval forms of echinoderm is bilaterally symmetric but adults are radially symmetric.
Both assertion and reason are correct, but reason is not correct explanation for assertion.

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