A) umbilical cord
B) amnion
C) yolk sac
D) chorion
Correct Answer: A
Solution :
Umblical cord connects the foetus to placenta of mother. It is mainly consists of allantoic mesoderm and blood vessels (Umblical artery and veins). Amnion is an extra embryonic membrane fomed in reptile, birds and some mammals by extra embryonic ectoderm and mesoderm growing up and over embryo. It provides an aquous environment in which the embryo is protected from shocks and adhesion. Yolk sac is a membrane that surrounds the yolk. In mammals, it is reabsorbed before the embryo is homed. Chorine lies just beneath the egg shell. It completely encloses the developing embryo and extra embryonic tissues. The chorine is highly specialized to facilitate the transfer of nutrients, gases and wastes between the embryo and the mothers body.
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