1st semester final

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)

A possible explanation for why something happens is called ___.

• a variable

• an experiment

• a hypothesis

• an assumption

The variables you keep the same in the experiment are called

• independent variables

• dependent variables

• controlled variables

• hypothesis

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

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

How does the amount of light affect the growth of a plant? What's the Independent Variable?

• The amount of plant growth

• The amount of light

• The type of light

• The type of plant