Question

The allantois has similar layers as present in the yolk sac. These are

• A. Outer mesoderm and inner endoderm.
• B. Outer endoderm and inner mesoderm.
• C. Outer endoderm and inner ectoderm.
• D. Outer endoderm and inner endoderm.

Answer 1

Answer: (A)

Outer mesoderm and inner endoderm.

The allantois of human consists of an endodermal evagination of the hindgut, which is still developing and this endoderm gets surrounded by mesodermal tissue.
Thus, the correct answer is option (A), 'Outer mesoderm and inner endoderm'.