Poultry Judging Practice Test 2026 – Complete Exam Prep

The chorion is the correct answer because it is the outermost membrane that surrounds the embryo in an egg during incubation. This membrane is crucial as it serves several important functions. Primarily, it plays a key role in gas exchange, allowing oxygen to enter the egg and carbon dioxide to escape, which is essential for embryonic development. The chorion lies adjacent to the eggshell, facilitating this gas exchange while also providing a protective barrier for the embryo.

To clarify the context, the amnion is a membrane that surrounds the embryo and is filled with amniotic fluid, providing cushioning and protection. The yolk sac, on the other hand, contains the yolk that nourishes the developing embryo. Lastly, the allantois is an embryonic membrane involved in waste management and respiration but does not lie directly next to the shell. Each of these membranes plays vital roles in development, but it is the chorion that is specifically associated with the area next to the shell during incubation.