- Jamie decided to see if hampsters ran through a maze faster while listening to rap music. 5 hampster went through the same maze without music, while the other 5 went through the maze with rap music. Jamie timed the hampsters and recorded the speed of the hampsters in seconds. What is the dependent variable in the above experiment?
Your answer:
rap music
speed of hampsters
type of cheese at the end
shape of maze
- Factors that remain the same in an experiment for both the experimental and control set-up.
Your answer:
dependent variable
control
independent variable
constants
- Sarah designed an experiment to find out which mouthwash was most effective against some bacteria. She cut out four different circles from a paper towel and soaked each circle in a different mouthwash. She put the circles on a nutrient agar-coated Petri dish that was covered with bacteria commonly found in the mouth. She then incubated the plate for 24 hours. The picture shows the results of this test. Which of the following should Sarah do to improve her experiment?
Your answer:
Use the same type of mouthwash on each paper circle.
Use different kinds of bacteria.
Use a smaller Petri dish.
Use the same size paper circles for all mouthwashes.
- Joe decided to see if fertilizer affects the growth of tomato plants. He planted 40 tomato plants total. 20 of the plants received 5 ounces of fertilizer in each pot. All 40 plants received the same amount of water every week and were exposed to the same amount of sunlight in the green house. What is a constant from the experiment?
Your answer:
same amount of water
different amounts of water
growth of plants over time
fertilizer put on all plants
- Hypothesis: More pine seeds germinate after a forest fire. The most valid and reliable test of this hypothesis would include an experimental group of pine seeds that was recovered from a fire area and pine seeds that were--
Your answer:
germinated after a fire
placed in a fire
found before a fire
tolerant of fire
- Which sentence best states the importance of using control groups?
Your answer:
Control groups eliminate the need for statistical tests and simplify calculations.
Control groups eliminate the need for large sample sizes, reducing the number of measurements needed.
Control groups allow comparison between subjects receiving a treatment and those receiving no treatment.
Control groups provide a method by which statistical variability can be reduced.
- What is the dependent variable in the graph above?
Your answer:
months
mass (kg)
healthy plant
plant with fungus
- A student wants to view cells under the compound microscope at a total magnification of 400X. If the eyepiece is 10X, which of the following objective lenses should be used?
Your answer:
40X
100X
4X
10X
- The variable that the scientist has control of and chooses to test.
Your answer:
dependent variable
co-dependent variable
independent variable
stable variable
- This characteristic of life refers to the maintenance of the internal environment within tolerable limits. All sorts of factors affect the suitability of our body fluids to sustain life; these include properties like temperature,salinity, acidity, and the concentrations of nutrients and wastes. What is this characteristic of life that refers to the maintenance of stable conditions?
Your answer:
response
metabolism
homeostasis
excretion