Controlled Experiments

Experiment: Does the flavor of ice cream effect how fast the ice cream melts?
The flavor of ice cream is the ___________ variable.

• independent
• dependent

Tags

NGSS.MS-PS3-4

Experiment: Does changing the wing shape to make it more narrow affect the distance a paper airplane will fly?

The wing shape is the ___________  variable.

• independent
• dependent

Tags

NGSS.MS-PS2-2

Experiment: How does watching TV during studying affect a student’s test grades?

The students grades are the ___________ variable.

• independent
• dependent

Experiment: Do roses grow more in height in partial or direct sunlight?
The growth height is the ____________  variable.

• independent
• dependent

Tags

NGSS.MS-LS1-5

Experiment: How does adding cardio to one’s daily schedule affect their heart rate?
The heart rate is the ________________  variable.

• independent
• dependent

The independent variable is the

• one you measure.
• one you change.

You can have more than one independent variable in a controlled experiment.

• True
• False

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

A student wants to test how different amounts of UV light affect the growth of the bacteria, Staphylococcus aureus. She wants to grow the bacteria in petri dishes for her experiment. Which of the following variables should NOT be held constant in this experiment?

• amount of UV light bacteria is exposed to

• amount of time to grow bacteria

• location of petri dishes while growing bacteria

• type of bacteria (Staphylococcus aureus)

Tags

NGSS.MS-LS1-5

A student performed an experiment that tested how many days it takes different types of grass seed to grow to a height of two inches. Four types of grass seed were tested, and the student recorded the number of days for each type to grow. Use this information to answer the next question.

What should be held constant in this experiment?

• amount of sunlight, amount of water, and type of soil

• amount of sunlight

• amount of water and type of soil

• amount of water

Tags

NGSS.MS-LS1-5