Question

What are the three membranes in the amniotic egg? What are the functions of these membranes? What

are the advantages and disadvantages of this type of egg?

Answer 1

Answer: Firstly i like to recorrect the question as in case of amniotic egg there are basically four membrane instead of three.

The four membranes with their functions are:

1: Amnion membrane --- it is the inner most membrane which contain fluid which help to stabilize  the temperature and also maintain the proper consistancy of chemicla substances required for embryo development.

2.Yolk sac----- It is th second mebrane which is helpful to provide nutrition for developing embryo as this membrane contain lots of protein and fat.

3.Annantois---- It is the third membrane  which is basically responsible for the storage of metabolic waste material. In later stage it also act as   respiratory surface (responsible for gaseous exchange for O2 and Co2)

4.Chorion---- It is fourth membrane which is the outer most membrane so it protect from external sock and also protect from environmental stress. As it contain the fluid called as chorionic fluid which help to absorb sock and force experienced from outside environment.and also help in gaseous exchange.

Advantage of  amniotic egg: This is generally present in reptiles and birds and mammals. In case of birds and reptiles after the egg laying there is no connection of egg with the maternal tissue so as amniotic egg contain all the required things for their development hence it can grow safely without the maternal tissue connection also in case of birds and reptiles.So amniotic egg is advantageous because of presence of all required material it allows the more quick development of embryo. It is also free from competition for food required for development. But the basic disadvantages of this is that as it is very delicate so it must require solid or stationary surface to laid on and also there is risk of attack of   predators(means it need extra protection)