Gas Exchange in Chicken Egg Essay

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How Gases Are Exchanged in a Chicken Egg Problem: How can the chicken exchange gases during the 21 day period of development? Introduction: In humans, the embryo will receive all its needs from the mother, specifically from the placenta. One of these vital needs, which is oxygen, is sent to the embryo through the umbilical cord within the mother. However, for animals such as the chicken, the embryo is not developed inside a mother, but rather inside an egg, prompting the question as to how gases are exchanged in an egg. One suggestion would be that there is enough air in an egg to last the chicken 21 days, but that can’t possibly be correct because the chicken is constantly growing, making no room for oxygen. The correct solution would then have to be that an egg has thousands of micro-pores on its shell, allowing the chicken to exchange gases. Variables: Independent Variable: the temperature of the water Dependent Variable: how many bubbles are produced Controls: metal pan, tap water, same amount of water, same type of egg Hypothesis: If you put an egg in hot water, then gases will leave through the micro-pores as streams of rising bubble. Since heating air in a container will cause it to expand, then the air inside the egg will expand to the point where they leave the egg as bubbles. Materials: -metal pan -spoon -ladle -2 large brown eggs -2 liters of tap water (1 L per egg) Procedure: 1) Pour 1 L of room temperature tap water into the metal pan 2) Place the egg carefully into the pan 3) Observe for any streams of bubbles 4) Empty the pan and fill it again with 1 L of tap water 5) Heat the pan until the water is boiling 6) Stir the water using a spoon to get rid of anything bubbles 7) Place the 2nd egg carefully into the pan using a ladle 8) Observe for any streams of bubbles Data: Observations Amount of

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