Assertion (A): Organisms belonging to cnidaria do not possess coelom.
Reason (R): Cnidarians are diploblastic animals

Assertion(A) is true and reason(R) is false.

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Both assertion(A) and reason(R) are true, but reason(R) is not the correct explanation for assertion.

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Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A).

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Assertion(A) is false and reason(R) is true.

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Solution

The correct option is C Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A).
Correct option: (a) Both assertion (A) and reason (R) are true and reason(R) is the correct explanation for assertion(A).

$∙$ Cnidarians are diploblastic, that is, two embryonic layers, an external ectoderm and an internal endoderm.
$∙$ They lack mesodermal layer.
$∙$ Hence, they do not possess a true coelom.
$∙$ So, both assertion and reason are true, and reason is the correct explanation for the assertion.

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