Which one of the following is the additional function of the embryonic membranes?

Explanation

During the development of chick and other vertebrates, there are produced certain tissues or structures that temporarily or permanently do not enter into the formation of the embryo themselves but are external to and devoted in one way or another to the care and maintenance of the developing embryo. Collectively these parts are termed fetal membranes, extra-embryonic sacs, or extra-embryonic membranes. Extra-embryonic membranes developed are: i. Amnion or amniotic sac: which surrounds the embryo and provides a kind of private aquarium to protect it from mechanical shocks (such as pressure, abrasion, irritation) and desiccation. ii. A serosa or chorion: which forms the outermost membrane surrounding the rest of the embryonic system. iii. A yolk sac: which is filled with the yolk of the egg functions as the first respiratory organ and as a digestive organ for the embryo. It also acts as a hemopoietic organ like the liver and at later stages serves as a place of origin for blood cells. iv. An allantois: which is a precocious urinary bladder by origin, accumulates the embryonic nitrogenous wastes (non-toxic uric acid) and also acts as an embryonic respiratory surface. In short, They typically perform roles in nutrition, gas exchange, and waste removal