A: In Aves and Mammals, the heart is four-cha | vedclass

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Question

(B) Statement $A$ is true: Both $Aves$ (birds) and $Mammals$ possess a four-chambered heart, consisting of two atria and two ventricles, which prevent

Vedclass · Accepted Answer

$A$ and $R$ are both true, but $R$ is not the correct explanation of $A$.

Vedclass · Answer

(B) Statement $A$ is true: Both $Aves$ (birds) and $Mammals$ possess a four-chambered heart, consisting of two atria and two ventricles, which prevents the mixing of oxygenated and deoxygenated blood.Statement $R$ is true: In $Mammals$, the systemic aortic arch curves to the left (left aortic arch), whereas in $Aves$, it curves to the right (right aortic arch).However, the fact that the aortic arch curves to the left in mammals is an anatomical characteristic of mammals, but it does not explain why the heart is four-chambered. Therefore, $R$ is not the correct explanation of $A$.

Column-$I$	Column-$II$
$(a)$ Coelenterata	$(i)$ Parapodia
$(b)$ Arthropoda	$(ii)$ Radula
$(c)$ Annelida	$(iii)$ Malpighian tubules
$(d)$ Mollusca	$(iv)$ Cnidoblasts

$A$: In $Aves$ and $Mammals$, the heart is four-chambered.
$R$: In $Mammals$, the aortic arch curves to the left.

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Match the following columns and select the correct option.
Column-$I$ Column-$II$
$(a)$ Coelenterata $(i)$ Parapodia
$(b)$ Arthropoda $(ii)$ Radula
$(c)$ Annelida $(iii)$ Malpighian tubules
$(d)$ Mollusca $(iv)$ Cnidoblasts

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$A$: In $Aves$ and $Mammals$, the heart is four-chambered.$R$: In $Mammals$, the aortic arch curves to the left.