Unit 1-target 8-experimental Design Quiz

1. How many independent variables should there be in a controlled experiment?

2. Other than the independent variable, all other factors in the experiment should be kept ___ for both the experimental group and control group.

3. Mrs. Lewis set up a lab for her biology students using a culture of the small crustacean Daphnia, obtained from a pond that was 20°C. The students are to investigate the effect temperature has on Daphnia. The students will observe the crustacean's heartbeat under the microscope, at the following temperatures: 0°C, 10°C, 20°C, 30°C, and 40°C. They will count the number of heartbeats per sec.What is the independent variable in the experiment?

4. Dr. Hansen performs an experiment testing the effectiveness of different cough syrups. Identify the dependent variable in the experiment.

5. Ebola virus is a potentially deadly virus in the blood which causes Ebola fever. Ebola virus is often spread by monkeys. Scientists used 2 groups of monkey kidney cells in an experiment to confirm the first human case of Ebola fever. The scientists inoculated cells in Group 1 with samples of the Ebola virus taken from a human with Ebola fever. They did not inoculate the cells in Group 2. What was the control group in the experiment?

6. Aisha wants to conduct an experiment to determine whether sun and shade varieties of the same plant species prefer the same wavelengths of light. She plans to measure rates of photosynthesis. Which design would be best for her experiment.

7. Lydia works in a flower shop after school. She notices that the hydrangeas inContainer 1 have pink blossoms, while the hydrangeas in Container 2 have blueblossoms. She makes sure they all receive the same amount of light and water. Her boss tells her that the flowers were all grown from the same seed variety. Lydia discovers, after testing the soil, that although the same type of soil was used, the soil in Container 1 has a pH of 6.0, and the soil in Container 2 has a pH of 5.0.Lydia most likely conducted her investigation to answer what question about hydrangeas?

8. Morgan hypothesizes that the activity of amylase, an enzyme that catalyses the breakdown of starch, will be greater at 37°C than at 25°C. She prepares 2 tubes: Tube 1 and Tube 2. Morgan adds 2 g of starch and 1 mL of an enzyme suspension to Tube 1 and incubates it at 37°C for 20 min. To accurately test her hypothesis, Morgan should add 2 g of the starch and 1 mL of the enzyme suspension to Tube 2 and incubate it at ______ for ______.

9. Scientific experimentation can most likely answer which question regarding a bird population?

10. Mrs. Lewis set up a lab for her biology students using a culture of the small crustacean Daphnia, obtained from a pond that was 20°C. The students are to investigate the effect temperature has on Daphnia. The students will observe the crustacean's heartbeat under the microscope, at the following temperatures: 0°C, 10°C, 20°C, 30°C, and 40°C. They will count the number of heartbeats per sec.If the experiment is designed correctly, what will the students choose for the experimental treatment?