A: Birds have metanephric kidneys and no urin | vedclass

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Question

(B) Assertion is correct: Birds possess advanced metanephric kidneys. The absence of a urinary bladder is a significant flight adaptation to reduce bo

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) Assertion is correct: Birds possess advanced metanephric kidneys. The absence of a urinary bladder is a significant flight adaptation to reduce body weight.Reason is correct: The South American Ostrich $(Rhea \ 	ext{americana})$ is a flightless bird and is an exception among birds as it possesses a urinary bladder.Conclusion: Both Assertion and Reason are true,but the Reason does not explain why birds generally lack a urinary bladder.

$A$: Birds have metanephric kidneys and no urinary bladder.
$R$: South American Ostrich has a urinary bladder.

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$A$: Birds have metanephric kidneys and no urinary bladder.$R$: South American Ostrich has a urinary bladder.