Understanding Variables in Experiments

Which of the following is an example of an independent variable in an experiment?

• The amount of sunlight a plant receives

• The height of a plant

• The type of soil used

• The temperature of the room

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DOK Level 1: Recall

In a scientific experiment, what is the role of a control variable?

• To change the outcome of the experiment

• To remain constant throughout the experiment

• To be measured as the experiment progresses

• To be the main focus of the experiment

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DOK Level 1: Recall

Identify the dependent variable in the following scenario: A scientist is testing how the amount of water affects the growth of a plant.

• The type of plant

• The amount of water

• The growth of the plant

• The type of soil

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DOK Level 1: Recall

Which of the following best describes a dependent variable?

• It is the variable that is changed or controlled in a scientific experiment.

• It is the variable that is measured and affected in the experiment.

• It is the variable that remains constant throughout the experiment.

• It is the variable that is not important to the experiment.

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DOK Level 2: Skill/Concept

In an experiment to test the effect of temperature on the solubility of sugar in water, what would be the independent variable?

• The amount of sugar

• The temperature of the water

• The amount of water

• The time taken for sugar to dissolve

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DOK Level 1: Recall

Why is it important to have control variables in an experiment?

• To ensure that the experiment is biased

• To make the experiment more complex

• To ensure that the results are due to the independent variable only

• To increase the number of variables in the experiment

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DOK Level 2: Skill/Concept

In a study to determine the effect of fertilizer on plant growth, which of the following could be a control variable?

• The type of fertilizer used

• The amount of fertilizer used

• The type of plant used

• The growth rate of the plant

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DOK Level 1: Recall

What is the main purpose of an independent variable in an experiment?

• To be the variable that is measured

• To be the variable that is changed or manipulated

• To be the variable that remains constant

• To be the variable that is ignored

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DOK Level 2: Skill/Concept

In an experiment to test the effect of different types of music on concentration levels, what is the dependent variable?

• The type of music

• The concentration levels

• The volume of the music

• The duration of the music

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DOK Level 1: Recall

Which of the following statements is true about control variables?

• They are the variables that are changed in an experiment.

• They are the variables that are measured in an experiment.

• They are the variables that are kept constant to ensure a fair test.

• They are the variables that are ignored in an experiment.

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DOK Level 2: Skill/Concept