Which is not correct about circulatory system of aves

Heart is four chambered

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Well developed renal portal system

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Sinus venosus and truncus arteriosus are lacking

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RBCs are nucleated

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Solution

The correct option is A Well developed renal portal system
Birds do have a four-chambered heart.
Their RBCs are nucleated.
Sinus venosus and truncus arteriosus are lacking in birds.
But the renal portal system of birds is not well developed. They do not have a urinary bladder and being uricotelic animals, excrete uric acid along with semisolid faeces.
So, the correct answer is 'Well developed renal portal system'.

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