1. The table below shows the number of algae that exist after hours of living in an aquatic environment.

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1 1. The table below shows the number of algae that exist after hours of living in an aquatic environment. 4. Below is a graph that shows the activity of a mouse for Monday and Tuesday. At this rate, how many algae will there be after 6 hours? A) B) C) D) 2. In August, this leaf was found on a tree. In October, the tree's leaves were a different color. Use the leaf flowchart below to name the tree the leaf is from. On Wednesday, the mouse would probably be most active at A) 9 A.M. B) 12 noon C) 9 P.M. D) 12 midnight A) White Spruce B) White Oak C) American Elm D) White Pine 3. In an experiment, a student filled one funnel with clay and another with humus. She poured equal amounts of water in both funnels and positioned beakers to collect any water that was not held by the clay or humus. What does this experiment show? A) Clay and humus do not hold water. B) Humus holds water better than clay. C) Clay holds water better than humus. D) Clay and humus hold the same amount of water.

2 5. Base your answer to the following question on the cross section below. The cross section shows a typical bedrock structure where oil and natural gas deposits are found. According to the diagram, in which type of rock are these natural gas and oil deposits found? A) coarse-textured igneous rock B) foliated metamorphic rock C) porous clastic sedimentary rock D) intrusive crystalline sedimentary rock

3 Base your answers to questions 6 and 7 on the graph below, which shows the water levels of ocean tides measured in Boston, Massachusetts, for a 2-day period. 6. If the trends shown by the graph continue, which statement best describes the next low tide at Boston that is expected to occur on Wednesday? A) It will occur about 3 a.m. with a 0.4-meter water level. B) It will occur about 6 a.m. with a 0.6-meter water level. C) It will occur about 9 p.m. with a 2.6-meter water level. D) It will occur about 10 p.m. with a 2.8-meter water level. 7. The graph shows that high tides at Boston occur approximately every A) 3.5 hours B) 6.0 hours C) 12.5 hours D) 16.0 hours

4 8. Base your answer to the following question on the diagram below, which shows temperature changes within a parcel of air on a summer day. At 4,000 meters above Earth s surface, the temperature within the cloud is approximately A) 12 C B) 3 C C) 3 C D) 0 C 9. In order to test a hypothesis, a scientist would A) draw a conclusion. B) perform an experiment. C) identify the problem. D) organize information. 10. What is the part of an experiment that does not change, and serves as a basis for comparison? A) control B) hypothesis C) scientific method D) variable 11. In an experiment, a factor that is being tested is called a A) control. B) hypothesis. C) variable. D) check factor. 12. A group of people was used to test how well a new toothpaste reduces cavities. Which of the following is the dependent variable in this experiment? A) Have everyone in the group brush with the new toothpaste. B) the people C) the new toothpaste D) the number of cavities 13. The logical and systematic process of solving a problem is known as A) an observation. B) the conclusion. C) the scientific method. D) a hypothesis. 14. A student performed an experiment designed to test the rate of evaporation of different solutions. He had different beakers containing water mixed with various substances, as well as one with just water. The beaker containing only water is known as the A) control. B) dependent variable. C) independent variable. D) hypothesis. 15. A student says "If I add water then it will conduct electricity." A scientist would classify this statement as A) a hypothesis. B) an experiment. C) a conclusion. D) a fact.

5 16. Which statement best describes a scientific theory? A) It is a collection of data designed to provide support for a prediction. B) It is an educated guess that can be tested by experimentation. C) It is a scientific fact that no longer requires any evidence to support it. D) It is a general statement that is supported by many scientific observations. 17. Which of the following statements can not be tested by scientific study? A) Nuclear power plants release fewer pollutants into the air than fossil fuels do. B) The burning of fossil fuels releases carbon dioxide into the air. C) Solar energy panels release fewer pollutants than fossil fuels do. D) Fossil fuels should be avoided because it is wrong to pollute the air. 18. A student wants to find out if the rainfall in her town contains pollutants. The best way to gather this information would be to collect A) one sample on one rainy day. B) one sample a day on several rainy days. C) several separate samples on one rainy day. D) several separate samples on several rainy days. 19. What is the final step of the scientific method? A) identifying the problem B) drawing conclusions C) performing an experiment D) forming a hypothesis 20. A gardener did an experiment to determine which of the three brands of fertilizer would produce the most growth in his plants. For three different plants of the same species, he used each of the three brands of fertilizer. Once a week, he made observations for each plant. Which would have improved the experiment? A) Using a different species of plant for each brand of fertilizer. B) Mixing the fertilizers. C) Making observations every two weeks. D) Testing each fertilizer with more than one type of plant. 21. Why is it important to accurately record the procedures and results of an experiment? A) So that you know what you did. B) So that others can admire your work. C) So that others can check to see if you did your experiment correctly. D) So that others can repeat your experiment to see if they get the same results. 22. Two companies make baseballs, and each claims that its ball goes farther. Which would be the best scientific evidence to decide which ball goes farther? A) A baseball player hits each ball, and one measures how far each goes. B) A machine hits each ball with exactly the same force, and one measures how far each goes. C) Read the results of tests conducted on the two balls by each company. D) Sets up a survey and ask 500 baseball players which ball goes farther. 23. When heating liquid materials in laboratory glassware, a student should always A) wear safety goggles B) use Benedict's solution C) use a chipped test tube D) record the temperature of the liquid 24. All of these activities are examples of safe laboratory practices except A) wearing goggles and aprons. B) leaving boiling water unattended. C) cleaning glassware before storing them in labeled cabinets. D) rinsing glassware with distilled water after washing. 25. A sign in a chemistry lab says "Never drink from the glassware." What is the most likely reason for this warning? A) Many of the chemicals used are poisonous. B) The chemicals are reused. C) It could spread germs. D) The glassware could have broken pieces of glass in it.