A : The lungs of birds are provided with air | vedclass

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(B) Assertion is true: Birds possess air sacs connected to their lungs. These $8$ or $9$ air sacs are situated on either side of the lungs and help in

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) Assertion is true: Birds possess air sacs connected to their lungs. These $8$ or $9$ air sacs are situated on either side of the lungs and help in maintaining a continuous flow of air.Reason is true: Air sacs significantly increase the efficiency of respiration in birds. They ensure that air passes over the gas exchange surfaces in a unidirectional manner,preventing the mixing of oxygenated and deoxygenated air.Conclusion: While both statements are scientifically accurate,the presence of air sacs (anatomical feature) is not the direct cause of them supplementing respiration (physiological function); rather,they are structural adaptations that facilitate the process. Therefore,the Reason is not the correct explanation of the Assertion.

Column-$I$ (Invertebrates)	Column-$II$ (Respiratory Organs)
$P$. Sponges,Coelenterates,Flatworms	$I$. Gills
$Q$. Earthworms	$II$. Simple diffusion through body surface
$R$. Insects	$III$. Vascularized bags (Lungs)
$S$. Aquatic arthropods and molluscs	$IV$. Tracheal tubes
$T$. Terrestrial arthropods and molluscs	$V$. Moist cuticle

$A$ : The lungs of birds are provided with air sacs.
$R$ : Air sacs supplement respiration.

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$A$ : The lungs of birds are provided with air sacs.$R$ : Air sacs supplement respiration.