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Multiple Choice: Choose the answer that best completes the statement or answers the question.1. When a student’s experiment produces data that doesn’t support their hypothesis, they may wonder if their experiment was well designed. Why should a student not be concerned with their experimental design in this situation?AAll researchers make mistakes in their data, so they can throw away any results that don’t agree with their hypothesis.BErrors in experimental design don’t affect the outcome of the experiment, so they should run the experiment until they get the expected results.CAn experiment that produces unexpected results may lead to additional research and a modified experiment that provides answers.DAll experiments are flawed due to the nature of the scientific method.A student writes the following statement: “If I exercise three times each week and reduce the amount of fatty food that I eat, and then I will lose weight and decrease my cholesterol level.”2. This is an example of aAhypothesisBtheoryClawDcontrol3. At 16°C, what percentage of the brook trout reached maximum size?A30%B55%C75%D95%4. In the study of the life cycle of moths, which of the following questions would be the least important to answer?AHow much do moths eat?BHow long do moths live?CHow many scientists have studied moths?DDoes temperature affect the growth of moths?Questions 5 and 6 refer to the following:5. What factor is the independent variable in the investigation described?AMoistureBTemperatureCNumber of seedsDSize of the pans6. What factors must remain constant in the investigation described to ensure the results are valid?ASize of the seeds and the same temperature for each of the pans.BTypes of seeds and the moisture level.CTypes of seeds and the size of the pans.DSize of the pans and the amount of time given until germination.In an investigation of the cycling of environmental gases, a student placed water and bromothymol blue in each of four test tubes as shown in the diagrams below. No additional items were placed in tube 1, a snail was placed in tube 2, an aquatic plant (elodea) was placed in tube 3, and both a snail and an elodea were placed in tube 4. The tubes were then sealed and placed in bright light for 24 hours.7. The function of tube 1 in the investigation shown is toAdetermine the amount of gases in the water.Bdemonstrate the transparency of the solution.Cdetect the presence of glucose.Dserve as a control.The table shows the results of an experiment a student conducted to find the average resting heart rate of individuals of different ages. The heart rate is measured in beats per minute.8. According to the table shown, a resting heart rate of fewer than 90 beats per minute is likely to be found in participants A15 years old and youngerB7 years oldC15 years old and olderD7 years old and younger9. After observing a hummingbird in her flower garden, Sandy thought hummingbirds must be more attracted to feeders with flowers on them than to plain feeders. Which of these experimental setups is the best design to test her hypothesis?10. Which piece of laboratory equipment should a student use to remove the legs of a preserved grasshopper for further study?The diagram below represents a graduated cylinder containing a liquid.11. How many milliliters of the liquid should be added to the graduated cylinder to raise the volume to 21 mL?A8 mLB5 mLC10 mLD4 mLThe diagram below shows the result of a field study on the effect of low pitched sounds on elephant behavior. Four speakers were placed on the elephant range and different low pitched sounds were transmitted from each speaker.12. If Speaker A was moved to the edge of the waterhole, what change in elephant behavior, if any, would most likely occur?ANo change would occur because elephant behavior cannot be modified.BThe elephants would go to the waterhole only when they needed water.CA larger number of elephants would gather at the waterhole.DAll the elephants would gather around Speaker C.A student measures his pulse rate while he is watching television and records it. Next, he walks to friend’s house nearby and when he arrives, measures and records his pulse rate again. He and his friends then decide to run to the mall a few blocks away. On arriving at the mall, the student measures and records his pulse rate once again. Finally, after sitting and talking for a half hour, the student measures and records his pulse rate for the last time.13. Which graph below best illustrates the expected changes in his pulse rate according to the activities described above? ................
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