WorksheetsVariables and Groups Review
Total questions: 20
Worksheet time: 12mins
Which of the following is the label for the independent variable.
Money Collected
Raising Money
Boxes Sold
None of the above
The one factor that a scientist changes during an experiment.
Controlled Variable
Dependent Variable
Independent Variable
The variable that is measured.
Controlled Variable
Dependent Variable
Independent Variable
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.
What is the independent variable?
Dropping the same way
Wing Length
Amount of time it takes the helicopter to hit the floor
Dropping from the same height
Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground.
What is the dependent variable?
Dropping the same way
Wing Length
Amount of time it takes the helicopter to hit the floor
Dropping from the same height
Ms. DiGeronimo wanted to see how different types of music affected students' pulse rates. She played different types of music: heavy metal, rap, R&B, alternative, pop, country, and classical music. What constant should be considered when doing this experiment?
types of music
using a different student for each music type
amount of time the music was played
Pulse rate of students
A group under normal conditions that is used as a baseline for comparison in an experiment
dependent variable
experimental groups
constants (controlled variables)
control groups
Which of the following terms refers to factors that remain the same in all groups?
Constants (controlled variables)
Control group(s)
A scientist does an experiment to see if acids have an effect on the health of a plant. Three sets of plants were treated with acidic solutions (acids have pH lower than 7 -- the strongest acid is pH 1) while the control set was treated with a solution of neutral pH 7. Which is the best conclusion for this experiment?
High acidity is helpful to this type of plant.
Low acidity is harmful to this type of plant.
Using the picture, identify the control group.
Trial 1
Trial 2
Trial 3
What is the best conclusion for this experiment?
The cooler the temperature, the louder the crickets chirp.
The crickets cannot chirp at temperatures lower than 10 degrees C.
The warmer the temperature, the more often crickets chirp.
The temperature and the chirping of crickets are not related.
This experiment was done to find out which mouthwash kills bacteria most effectively. Each disk was soaked in a different brand of mouthwash. What change would improve the experiment?
Use a smaller plate with less food and moisture
Use bacteria from many habitats, instead of just from the mouth
Use the same size paper disk for each mouthwash
Use only 1 brand of mouthwash for every disk
There is a new vitamin supplement designed to prevent the flu. It was given to two groups. After 10 weeks, neither group reported a case of the flu. What would make this study more valid?
Test only 1 group with 200 mg of the supplement
Test the supplement on both groups for only 5 weeks instead of 10
Test a third group that receives 150 mg of the supplement
Test a third group that does not receive the supplement
A student is designing an experiment to investigate the effect of light on the rate of ripening of tomatoes. She set up 4 pots of the same size and identical amounts of soil, water, and tomato plants. What label would be most appropriate for the third column of this table?
Height of tomato plants (cm)
Average ripening time (days)
Average weight of tomatoes per plant (grams)
Acidity of tomatoes (pH)
A student did an experiment to find the relationship between breathing rate and exercise. She separated students into 3 groups as shown in the table. What was the purpose of finding the respiratory rates of the students at rest?
To determine if the students were healthy
To practice using the timer
To use as a baseline for comparison
To use as the variable
A student did an experiment to test how effective different antibiotics are. She treated one paper disk with water, and three others with different antibiotics. Each was placed on a dish where bacteria could grow. What is the purpose of the disk treated with water?
It serves as the conclusion for the expeirment
It is needed to provide additional moisture
It serves as a control group
It is needed for safety
A student did an experiment to test how effective different antibiotics are. She treated one paper disk with water, and three others with different antibiotics. Each was placed on a dish where bacteria could grow. What is the independent variable?
The bacterial growth
The size of the paper disks
The type of antibiotic
The disk with water
A student did an experiment to find the relationship between breathing rate and exercise. She separated students into 3 groups as shown in the table. What is the dependent variable?
The type of activity
The group at rest
The groups who ran one lap or two laps
The average respiratory rate
A student is designing an experiment to investigate the effect of light on the rate of ripening of tomatoes. She set up 4 pots of the same size and identical amounts of soil, water, and tomato plants. What is the control group in this experiment?
The pots, soil, and water
Plant 1
The light intensity
The rate of ripening
