Question

Function of amnion in birds is
A) Nutrition
B) Excretion
C) Protection
D) None of the above

Answer 1

Hint:Amnion, is defined as a membrane that forms a fluid-filled cavity (the amniotic sac) that is found in reptiles, birds, and mammals that encloses the embryo. Often the amniotic sac and the fluid that is present in Amnion is referred to as the water bag.

Complete answer:
The amnion is lined with ectoderm and it is covered with mesoderm, and is made up of a thin, translucent fluid that suspends the embryo and thus provides a mechanical injury cushion. The amnion provides protection from the embryo's own fluid loss and against tissue adhesions. It gets extended considerably in-between two other membranes.
Now let us find solution from given options
A) Nutrition : Allantois is developed from splanchnopleure and it helps to form placenta that is helpful to provide nourishment.
B) Excretion : Chorion that occurs in reptiles and birds to act as a temporary respiratory organ while foetal excretions are deposited in its cavity.
C) Protection : Amnion is generated and developed from somatopleure and it is involved in the function of defence and protection.
D) None of the above : As one of the options is correct this option cannot be correct.

Hence the correct answer is option ‘C’ i.e, protection.

Note:In reptiles, birds, and mammals, Chorion, is also termed as Serosa, It is the outermost membrane around the embryo. On the surface of the yolk sac, it gets out from an outer fold. The chorion is defined as the outer shell of the insect egg in insects. The chorion is covered with mesoderm-lined ectoderm in vertebrates and is separated by an extraembryonic body cavity, the coelom, from other embryonic membranes.