1. An experiment was set up to test the effect of light intensity on the rate of photosynthesis, as shown in the diagram below.
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1 Name: Date: Period: 1. An experiment was set up to test the effect of light intensity on the rate of photosynthesis, as shown in the diagram below. Data were collected by counting gas bubbles released in a 5-minute period when the light source was placed at various distances from the experimental setup. The data are shown in the table below. The number of bubbles released when the light source is at a distance of 38 centimeters would most likely be closest to A) 6 B) 10 C) 13 D) 22 Page 1
2 2. Base your answer to the following question on the diagram below and on your knowledge of biology. The diagram represents a model cell setup. The locations of three different substances are indicated in the diagram. Which statement best describes what will most likely happen after several minutes? A) The contents of the model cell will change color. B) The model cell will shrink. C) The model cell will rupture. 3. Red onion cells undergo the change represented in the diagram below. This change is most likely caused by the cell being transferred from A) distilled water to salt water B) salt water to tap water C) salt water to distilled water Page 2
3 4. Base your answer to the following question on the diagram below and on your knowledge of biology. The diagram represents two solutions, A and B, separated by a selectively permeable membrane. Which statement best describes the outcome after 20 minutes? A) Solution A will contain approximately the same number of glucose molecules as solution B. B) Solution A will contain all of the water molecules. C) Solution B will remain unchanged. D) Solution B will lose all of the glucose molecules to solution A. Page 3
4 5. Base your answer to the following question on the information below and on your knowledge of biology. A student observers a red onion cell with a compound light microscope using low, then high power. The two views are represented below. Which diagram represents where the cell should be located in the low-power field of view to be sure the entire cell will be visible after switching to high power? A) B) C) D) Page 4
5 6. A model cell setup is represented in the "Initial State" diagram below. Which diagram indicates the area where each of these substances would be located after 20 minutes? A) B) C) D) Page 5
6 7. Base your answer to the following question on the diagram below of a microscope and on your knowledge of biology. 9. The diagram below represents the letter "h" as seen in the low-power field of view of a compound light microscope. Which diagram best represents the field of view if the slide is not moved and the objective is switched to high power? A) B) While viewing a specimen under high power, a student noticed that the specimen was out of focus. Which part of the microscope should the student use to obtain a clearer image? A) A B) B C) D 8. Which sequence contains the correct order of steps for a student to follow to observe the nucleus of protozoa in a stained wet mount, using a compound light microscope? C) D) 10. The diagram below represents a wet mount of a protist as seen under a compound microscope. A) 1 B) 2 C) 3 If the protist swims toward the left side of the slide, which diagram represents the image that will be observed through the microscope? A) B) C) D) Page 6
7 11. The diagram below shows an ameba moving out of the high-power field of view of a compound microscope in the direction indicated by the arrow. What should be done to center the ameba in the field of view and focus it sharply? A) Move the slide to the right, and refocus with the fine adjustment. B) Move the slide to the right, and refocus with the coarse adjustment. C) Move the slide to the left, and refocus with the fine adjustment. D) Move the slide to the left, and refocus with the coarse adjustment. Page 7
8 12. Base your answer to the following question on the data table below and on your knowledge of biology. The data table shows the concentrations of oxygen in parts per million (ppm) present in freshwater and seawater at various temperatures. Mark an appropriate scale on each labeled axis. Page 8
9 13. Base your answer to the following question on the information and diagrams below and on your knowledge of biology. The laboratory setups represented below were used to investigate the effect of temperature on cellular respiration in yeast (a single celled organism). Each of two flasks containing equal amounts of a yeast-glucose solution was submerged in a water bath, one kept at 20 C and one kept at 35 C. The number of gas bubbles released from the glass tube in each setup was observed and the results were recorded every 5 minutes for a period of 25 minutes. The data are summarized in the table below. Page 9
10 Identify the gas that would be produced by the process taking place in both laboratory setups. 14. An experiment was carried out to determine how competition for living space affects plant height. Different numbers of plants were grown in three pots, A, B, and C. All three pots were the same size. The data collected are shown in the table below. Analyze the experiment that produced the data shown in the table. In your answer be sure to: state a hypothesis for the experiment identify one factor, other than pot size, that should have been kept the same in each experimental group identify the dependent variable state whether the data supports or fails to support your hypothesis and justify your answer Page 10
11 15. Base your answer to the following question on Base your answer to the following question on the information below and on your knowledge of biology. You are the head of the research division of the Leafy Lettuce Company. Your company is experimenting with growing lettuce using hydroponic technology. Hydroponic technology involves growing plants in containers of growth solution in a greenhouse. No soil is used. The growth solution that the company uses contains water, nitrogen, and phosphorus. The company wants to know if adding iron to this formula will improve lettuce growth. Briefly describe how to test the effect of the formula with iron added. In your description, be sure to: state the problem state a hypothesis to be tested in the new experiment state how the control group will be treated differently from the experimental group identify two factors that must be kept the same in both the experimental and control groups state what type of data should be collected to support or refute the hypothesis Base your answers to questions 16 through 20 on the information and diagram below and on your knowledge of biology. The presence of air is believed to be important for root growth in bean plants. The apparatus available to conduct an investigation is shown below. There are enough bottles and other materials to have multiple setups. Air (for aeration) can be bubbled into the bottle through the rubber tube. Design an experiment to test the effect of aeration on the growth of roots of bean seedlings. In your answer, be sure to: 16. State one reason why several different kinds of seedlings were not tested in this experiment. 17. State one reason why many setups should be used in both the experimental and control groups. Page 11
12 18. Identify the dependent variable in the experiment. 19. Describe how the control group will be treated differently from the experimental group. 20. State one hypothesis the experiment would test. Base your answers to questions 21 through 24 on the spaces provided. Daphnia are freshwater organisms sometimes referred to as "water fleas." Design an experiment that could be used to test the effects of temperature on the size of a daphnia population. In your experimental design, be sure to: 21. Identify the type of data that will be collected 22. Identify the independent variable in the experiment 23. Describe how the control group will be treated differently from the experimental group 24. State a hypothesis to be tested 25. Base your answer to the following question on the information and diagram below and on your knowledge of biology. The diagram illustrates an investigation carried out in a laboratory activity on diffusion. The beaker and the artificial cell also contain water. Predict what would happen over time by showing the location of molecules I, G, and S in diagram B above. 26. State one reason why a molecule may not be able to pass into or out of a cell. Page 12
13 27. The diagram below represents a green plant cell viewed with the high power of a compound light microscope before and after a particular substance was added. Identify a substance that could have been added to the slide to bring about the change shown. 28. The diagram below represents a laboratory setup used to demonstrate the movement of molecules across a selectively permeable membrane. In the diagram below, draw the 5 starch and the 12 glucose molecules to show where they would most likely be located after 15 minutes. 29. Base your answer to the following question on the diagram below and on your knowledge of biology. The diagram represents a cell and its changes as a result of two laboratory procedure. A and B. Explain why procedure B has the opposite effect of procedure A. Page 13
14 30. Base your answer to the following question on the information and diagram below and on your knowledge of biology. A wet mount of red onion cells as seen with a compound light microscope is shown below. In the space below, sketch what cell A would look like after the addition of the salt. Page 14
15 Answer Key Midterm Review II 1. B 2. A 3. A 4. A 5. C 6. C 7. B 8. A 9. D 10. B 11. A CO2 or carbon dioxide. 14. (essay) 15. (essay) 16. This experiment was done to test the presence of air on root growth in bean seedlings only. There should be only one variable. 17. Many setups provide more data for drawing a valid conclusion. so your conclusion will be valid 18. number of roots length of roots rate of root growth 19. The control group will have no aeration. No air will be pumped through the rubber tube. 20. Roots of bean plant seedlings grown in aerated nutrient solution will grow faster than roots of seedlings grown without aeration of the nutrient solution. Bubbling air into the nutrient solution will lead to more root growth. If air is bubbled into the nutrient solution, then the roots will grow more rapidly. Air is important for root growth in bean plants. 21. change in the number of daphnia in the population number of daphnia at each temperature 22. Identifying the independent variable in the experiment as temperature. 23. The control group will be at normal temperature for the species. The control group will be at normal freshwater pond temeperature, while the experimental groups will be at other temperatures. 24. As temperature increases, the daphnia population decreases. Temperature has an effect on the size of a daphnia population. If the temperature decreases, then the size of the daphnia population decreases too large to pass through the cell membrane no receptor site faulty receptor site molecule is charged 27. salt salt solution In procedure B, distilled water is added to the cell. The distilled water goes into the cell and restores the cytoplasm to the normal size. Process B is to add distilled water to dilute the salt water. Water will move into the cell and fill it back up. Procedure B adds a new substances that causes water to reenter the cell. 30. Page 15
16 Answer Key Midterm Review II 14. Examples: Competition decreases plant height. Competition increases plant height. Competition has no effect on plant height. Examples: same potting soil (type or amount) environmental conditions (sunlight, H2O) type of plant Examples: height size Examples: The data supports my hypothesis because the plants in the pot with the greatest number. The data does not support my hypothesis because the plants in pot C (20 plants) were shorter than the plants in pot A (5 plants). The data did not support my hypothesis because the number of plants in the pot did affect the heights of the plants. 15. Adding iron to the hydroponic solution will improve the growth of lettuce. The control group should be grown in the solution that the company uses, which contains water, nitrogen, and phosphorus, while the growth solution for the experimental group should contain water, nitrogen, phosphorus, and iron. the intensity of light or the number of plants in the experimental and control groups or any other scientifically correct answer the height of the plants or the mass of the plants or the total leaf area of the plants [Note: Growth can only be accepted if attached to a measurable quantity.]
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