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 $X$ (Phylum)	Column $Y$ (Example)
$(1)$ Protozoa	$(P)$ Bath sponge
$(2)$ Coelenterata	$(Q)$ Liver fluke
$(3)$ Porifera	$(R)$ Jellyfish
$(4)$ Platyhelminthes	$(S)$ Opalina

Column-$I$	Column-$II$
$(a)$ Gregarious pest	$(i)$ Asterias
$(b)$ Radial symmetry in adults and bilateral symmetry in larvae	$(ii)$ Scorpion
$(c)$ Book lungs	$(iii)$ Ctenoplana
$(d)$ Bioluminescence	$(iv)$ Locusta

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

Similar Questions

Select the correct match for $X$ and $Y$:
Column $X$ (Phylum) Column $Y$ (Example)
$(1)$ Protozoa $(P)$ Bath sponge
$(2)$ Coelenterata $(Q)$ Liver fluke
$(3)$ Porifera $(R)$ Jellyfish
$(4)$ Platyhelminthes $(S)$ Opalina

Match the following columns and select the correct option:

Column-$I$ Column-$II$

$(a)$ Gregarious pest $(i)$ Asterias

$(b)$ Radial symmetry in adults and bilateral symmetry in larvae $(ii)$ Scorpion

$(c)$ Book lungs $(iii)$ Ctenoplana

$(d)$ Bioluminescence $(iv)$ Locusta

Ascaris and Cockroach resemble each other in

Give the names of the following:
$(a)$ $A$ limbless animal
$(b)$ $A$ cold-blooded animal
$(c)$ $A$ warm-blooded animal
$(d)$ An animal possessing dry and cornified skin
$(e)$ An animal having a canal system and spicules
$(f)$ An animal with cnidoblasts

Which one feature is common to leech,cockroach and scorpion?

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