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Standard XII
Biology
Open Circulatory System
Allantois is ...
Question
Allantois is embryonic membrane found in
A
Mammals
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B
Birds
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C
Reptiles
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D
Birds, mammals and reptiles
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Solution
The correct option is
B
Birds, mammals and reptiles
The extra-embryonic membrane arising as a pouch, or sac, from the hindgut which is found in reptiles, birds, and mammals.
So the correct option is 'Birds, mammals, and reptiles.
'
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In mammals, yolk sac regresses in size and function as soon as allantois is well developed.
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