A: Most birds possess only the left ovary and | vedclass

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(B) In most birds,the right ovary and oviduct are vestigial or absent during development to reduce body weight for flight,leaving only the functional

Vedclass · Accepted Answer

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

Vedclass · Answer

(B) In most birds,the right ovary and oviduct are vestigial or absent during development to reduce body weight for flight,leaving only the functional left ovary and oviduct. This is an evolutionary adaptation for flight.Regarding the Reason,in birds,the ruptured ovarian follicle does not transform into a corpus luteum (which is a structure found in mammals). Instead,the follicle undergoes rapid shrinkage and degeneration after ovulation.Both statements are scientifically accurate,but the Reason does not explain why birds have only one functional ovary; rather,it describes a physiological difference in their reproductive cycle compared to mammals. Therefore,the correct answer is $B$.

$A$: Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.
$R$: The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage.

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$A$: Most birds possess only the left ovary and left oviduct for conveying the ovum released from the ovary.$R$: The avian ovary does not form a corpus luteum from the ruptured ovarian follicle which undergoes rapid shrinkage.