3 Variables Science Test

What is the dependent variable in an experiment?

• The variable that is being measured or observed

• The variable that is manipulated by the researcher

• The variable that remains constant throughout the experiment

• The variable that is not relevant to the experiment

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By identifying the dependent variable, researchers can analyze the impact of the _______ variable on the experiment's outcome.

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Direction: Identify the independent variable in this example.

Suzy wanted to figure out if a plant will grow taller in the sun. She chooses two of the same plants and they will both get the same amount of water each day. One plant will go into a closet where there is no sunlight and the other will be placed by the window where there is sunlight.

• How tall the plant grows

• Amount of sunlight

• The amount of water

• The type of plant

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6-8.AF.3.1

Planning and Carrying Out Investigation

When Jackson, Rohan, and Evelyn are conducting a science experiment, they ensure that the temperature and humidity are the same throughout the experiment. This is called a ________ variable.

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Planning and Carrying out Investigation

Harper, William, and Evelyn are conducting a science experiment. Select the BEST response as to why it is important for them to maintain control variables in their experiment.

• They need all the variables to be the same.

• It's important because the control variables play a role in the experiment.

• They don't want to make too many changes or else they won't exactly know what causes a result to occur.

• The control variables make all the changes happen more easily.

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6-8.AF.3.1

Planning and Carrying Out Investigation

What is the dependent variable in the following scenario?

John wants to test if the amount of fertilizer affects the growth of plants. He sets up three groups of plants. Group A receives no fertilizer, Group B receives a small amount of fertilizer, and Group C receives a large amount of fertilizer. After two weeks, John measures the height of each plant.

• The amount of fertilizer

• The height of the plants

• The number of groups

• The duration of the experiment

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Owen wanted to see if drinking Gatorade instead of water would help him perform better in his football game. He drinks one before the game. What is wrong with this experiment?

• There is no independent variable.

• There is actually nothing wrong with this experiment.

• There is no dependent variable.

• There are no controlled variables.

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Match the following variables with the examples from this experiment.

• Control Variable

• Using different food dye to change the color of the water

• Dependent Variable

• Checking to see if the flowers' petals change color.

• Independent Variable

• Using the same white flower in the same white cup.

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Match in order:

Another name for the Independent Variable is ​(first answer) and another name for the Dependent Variable is (second answer) ​

(a)   ​ (b)  

• Cause
• Effect
• Nothing

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In a science experiment, Lily, Elijah, and David are trying to determine the effect of different factors on plant growth. How many variables should they change at a time in their investigation?

• 1 variable

• 2 variables

• 3 variables

• 0 variables

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6-8.AF.3.1