Independent and Dependent Variables

In an experiment to test the effect of different fertilizers on plant growth, you measure the height of the plants every week. What is the dependent variable?

• Type of fertilizer

• Height of the plants

• Amount of water

• Type of plants

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DOK Level 1: Recall

You are asked to design an experiment to test how the amount of exercise affects heart rate. Which of the following would be the independent variable?

• Heart rate

• Amount of exercise

• Type of exercise

• Age of participants

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DOK Level 2: Skill/Concept

In an experiment to determine the effect of different amounts of water on plant growth, what is the dependent variable?

• Amount of water

• Type of plant

• Growth of the plant

• Type of soil

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DOK Level 1: Recall

You are analyzing data from an experiment where different amounts of light were given to plants to see how it affects their growth. What is the independent variable?

• Amount of light

• Growth of the plants

• Type of plant

• Type of soil

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DOK Level 2: Skill/Concept

You are asked to analyze data from an experiment where different amounts of fertilizer were used to see their effect on plant growth. What is the dependent variable?

• Amount of fertilizer

• Type of plant

• Growth of the plant

• Type of soil

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DOK Level 2: Skill/Concept

In an experiment to test the effect of different types of soil on plant growth, what would be the independent variable?

• Type of soil

• Amount of water

• Growth of the plant

• Type of plant

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DOK Level 1: Recall

In an experiment to test the effect of temperature on the solubility of a substance, what would be the dependent variable?

• Temperature

• Solubility of the substance

• Type of substance

• Volume of solvent

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DOK Level 2: Skill/Concept

You are designing an experiment to test how different amounts of sleep affect memory retention. What would be a suitable dependent variable?

• Amount of sleep

• Memory retention

• Type of memory test

• Age of participants

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DOK Level 3: Strategic Thinking

The graph shows the distance traveled by Ms. Luce's family on a road trip. They will travel 25 miles each hour. Which statement is true about the situation?

• the independent variable is distance

• the independent variable is d=25 t

• the dependent variable is time

• the dependent variable is distance

On a graph, which axis shows the dependent variable?

• x-axis

• y-axis

• neither

• it changes

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NGSS.MS-PS3-1