Hypothesis testing Scientists discovered a new species of freshwater fish that l
ID: 141301 • Letter: H
Question
Hypothesis testing Scientists discovered a new species of freshwater fish that lives in a pond with a very low 02 level. When they measured the oxygen extraction efficiency of the fish, it was twice as high as that of closely-related fresh water fish. Answer the following questions. 1. Propose a hypothesis to explain how the fish achieve a high O2 extraction efficiency. 2. List predictions that derive from your hypothesis. Be as specific as possible. 3. Propose an experiment to test your predictions. Be sure to describe types of measurements you will make, and what comparisons you will make (i.e., what is your control group?).Explanation / Answer
Ans
1. Hypothesis :We know that gills are primary structure for extracting oxygen from water in fish of fresh water of abundant oxygen, but there are some fish which can survive in low amount of oxygen as they have also specialized skin along with gills for intake of oxygen.
2. Prediction: It is found by some scientist as a adaptation in low oxygen in water, some fish have specialized skin along gills which account additional 5 to 40 % cutaneous respiration with gills so that they can survive in very low amount of dissolved oxygen in water.
3. Experiment: In our experiment , control group is fish who can not survive in low oxygen. Water is taken out in two beaker and amount of dissolved oxygen is present in both the beaker are calculated by Winkler's method. In, one beaker, some impurity has been added, so that it's dissolved oxygen content become less. Fish that uses high oxygen, were dipped in both the beaker. In the one beaker, with high dissolved oxygen, that fish will survive but in other beaker with less oxygen content it get die.
The same experiment is repeated with fish that need low oxygen , this fish will survive in both the beaker. In, this way , hypothesis has been proved.
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