A membrane that surrounds the embryo is the

A membrane that surrounds the embryo is the

• A. Amnion
• B. Chorion
• C. Allantois
• D. Germ layer

Answer: (A)

The key idea here is the protective, fluid-filled membrane that directly envelopes the developing embryo. This membrane, called the amnion, forms a cavity—the amniotic cavity—filled with amniotic fluid. It cushions the embryo, allows free movement for growth, and helps maintain a stable, moist environment. Among the other options, the chorion surrounds the amnion and participates in forming the placenta, the allantois is involved in early fluid exchange and becomes part of the umbilical cord, and a germ layer is one of the embryonic tissue layers rather than a surrounding membrane. So the membrane that surrounds the embryo is the amnion.

The key idea here is the protective, fluid-filled membrane that directly envelopes the developing embryo. This membrane, called the amnion, forms a cavity—the amniotic cavity—filled with amniotic fluid. It cushions the embryo, allows free movement for growth, and helps maintain a stable, moist environment.

Among the other options, the chorion surrounds the amnion and participates in forming the placenta, the allantois is involved in early fluid exchange and becomes part of the umbilical cord, and a germ layer is one of the embryonic tissue layers rather than a surrounding membrane. So the membrane that surrounds the embryo is the amnion.