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

Vedclass · Accepted Answer

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

Vedclass · Answer

(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.

Column-$I$ (Animal)	Column-$II$ (Genus)
$P$. Sandworm	$I$. Nereis
$Q$. Earthworm	$II$. Hirudinaria
$R$. Leech	$III$. Pheretima

$A$: 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.

Similar Questions

Match the following columns:
Column-$I$ (Animal) Column-$II$ (Genus)
$P$. Sandworm $I$. Nereis
$Q$. Earthworm $II$. Hirudinaria
$R$. Leech $III$. Pheretima

Annelids are ..........

True coelom appeared first in the course of evolution in

Which of the following animals does $not$ undergo metamorphosis?

$A$: Annelids exhibit extracellular digestion.
$R$: The digestive tract in annelids is complete.

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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.