Practice-Identifying Variables in Science Experiments

In an experiment to test the effect of different amounts of water on the height of plants, what is the independent variable?

• The height of the plants

• The amount of water given to the plants

• The type of plants used

• The soil type

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DOK Level 2: Skill/Concept

A scientist is studying the impact of light on photosynthesis by exposing plants to different light intensities. What is the dependent variable in this experiment?

• The type of plants used

• The light intensity

• The rate of photosynthesis

• The amount of water given

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DOK Level 2: Skill/Concept

In an experiment to determine the effect of fertilizers on crop yield, which of the following would be considered a constant?

• The type of fertilizer used

• The amount of fertilizer used

• The type of crop being grown

• The crop yield

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DOK Level 2: Skill/Concept

A teacher wants to study the effect of missing assignments on students' grades. What is the independent variable in this experiment?

• The number of missing assignments

• The students' grades

• The subject being taught

• The number of students

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DOK Level 2: Skill/Concept

In an experiment to observe algae growth in different concentrations of fertilizer, what is the dependent variable?

• The type of fertilizer used

• The concentration of fertilizer

• The amount of algae growth

• The temperature of the water

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DOK Level 2: Skill/Concept

A gardener is testing the effect of different amounts of water on the height of plants. What should be kept constant in this experiment?

• The amount of water given

• The height of the plants

• The type of plants used

• The growth rate of the plants

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DOK Level 2: Skill/Concept

In an experiment to study the effect of sunlight on plant growth, what is the independent variable?

• The amount of sunlight

• The growth rate of the plants

• The type of soil used

• The amount of water given

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DOK Level 2: Skill/Concept

A researcher is studying the effect of different fertilizers on the yield of crops. What is the dependent variable in this experiment?

• The type of fertilizer used

• The amount of fertilizer used

• The yield of the crops

• The type of crops grown

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DOK Level 2: Skill/Concept

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

• The type of soil used

• The amount of water given

• The growth rate of the plants

• The type of plants used

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NGSS.MS-LS1-5

In an experiment to determine the effect of pH on bacterial growth, what is the dependent variable?

• The pH level

• The type of bacteria used

• The amount of bacterial growth

• The temperature