A: True coelom originated for the first time | vedclass

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(B) Assertion is true: $A$ true coelom (a body cavity lined by mesoderm on all sides) originated for the first time in the phylum $Annelida$.Reason is

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) Assertion is true: $A$ true coelom (a body cavity lined by mesoderm on all sides) originated for the first time in the phylum $Annelida$.Reason is true: The development of a true coelom provides space for the development of complex organ systems,allows the alimentary canal to be longer than the body (coiling),and provides space for storing gametes.However,the reason provided is a consequence of having a coelom,but it does not explain why the coelom originated for the first time in $Annelida$. Therefore,both are correct,but the reason is not the correct explanation for the assertion.

$A$: True coelom originated for the first time in phylum $Annelida$.
$R$: It allowed the animal to have an alimentary canal longer than the body and space for storing gametes.

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$A$: True coelom originated for the first time in phylum $Annelida$.$R$: It allowed the animal to have an alimentary canal longer than the body and space for storing gametes.