Processes of Science Review 1. A group used for comparison that does not receive the independent variable is the 2. The factor that is measured in an experiment is known as the] 3. The variable that is manipulated, or changed, by the experimenter is called the 4. Mechanics want to find if different tire treads affect the braking distance of a car. What is the independent variable? 5. Scientists questioned if the amount of fertilizer in soil can increase the amount of potatoes grown in a field. What is the dependent variable? 6. Al performed an experiment on tomato plants. He gave each plant the same amount of light, different amounts of water, and measured the height of each plant daily. What would be an hypothesis for this experiment? If... then... 7.Students wanted to test how the number of paper clips added to a paper plane could affect how far it flies. A paper clip was added to the plane before each test flight and students measured how far the plane flew. What would be a good control group forthis experiment? 8. A scientist tested what effect eating different types of food would have on blood sugar levels She selected ten 25-year old, healthy male subjects and observed them for three days. At 8:00 a.m. on each day, they ate a meal and had their blood sugar levels measured after. On Day 1 they ate a high fat diet. On Day 2 they ate a high protein diet, and on Day 3 they ate a high sugar diet. What is the independent variable in this experiment? 9. Jon is testing the hypothesis that increased levels of UV radiation reduces the growth of corn plants. He planted 200 corn seeds in two groups of 100 seeds each. He is trying to decide how much water, fertilizer, and UV radiation each group should receive. What factors should he keep the same in both plant groups? 10. A student planted 50 lima bean seeds and 50 green bean seeds 2 cm deep in soil. She gave them all the same amount of water and light. She measured the height of all seedlings every day to determine which type of seed grew the fastest. What are the constants (controlled variable) in this experiment