Embryonic Membranes Matching Solution

This question requires matching the extraembryonic membranes (List I) with their primary functions (List II) during embryonic development.

Membrane Function Matches

• A. Amnion: This membrane encloses the embryo in amniotic fluid, providing protection against mechanical shock and preventing desiccation. Therefore, Amnion matches with III. Protects the developing fetus from dessication.
• B. Chorion: The chorion is the outermost embryonic membrane. It plays a crucial role in facilitating gas exchange between the embryo and the external environment. Thus, Chorion matches with IV. Performs gas exchange between the developing embryo and the outside.
• C. Allantois: This membrane serves as a sac for storing metabolic waste products produced by the embryo and also contributes to gas exchange. Hence, Allantois matches with II. Collects the waste produced during the development.
• D. Yolk sac: The yolk sac contains the yolk, which is the primary source of nutrients for the developing embryo before hatching or birth. Therefore, Yolk sac matches with I. Sole source of food until hatching.

Correct Matching Combination

Combining these matches gives the correct sequence:

A-III, B-IV, C-II, D-I

This corresponds to the first option provided.