Q. Which is the extraembryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos?
The allantois is the extraembryonic membrane whose function is to store the excreted matter of the embryo and in placental mammals the allantois is present but it doesn't exert that function since the embryonic wastes are collected by the mother's body through the placenta.