Understanding the Independent Variable
This worksheet helps 7th-grade students identify and understand the role of the independent variable in scientific experiments.
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Understanding the Independent Variable
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Read each question carefully and answer to the best of your ability. This worksheet focuses on identifying and understanding the independent variable in scientific experiments.
1. In a scientific experiment, the factor that is intentionally changed or manipulated by the scientist is called the variable.
2. The independent variable is the cause, and the variable is the effect.
3. A good experiment should only have one variable to ensure clear results.
4. A scientist wants to test if different types of fertilizer affect plant growth. What is the independent variable in this experiment?
The amount of water given to the plants
The type of fertilizer used
The height of the plants
The amount of sunlight the plants receive
5. Which of the following best describes the independent variable?
The variable that is measured
The variable that stays the same
The variable that is changed by the scientist
The variable that is controlled by nature
6. Imagine you are testing how the amount of sugar affects the sweetness of lemonade. What would be your independent variable? Explain your choice.
7. A student conducts an experiment to see if the temperature of water affects how quickly sugar dissolves. They set up three beakers:
Beaker A: Water at 10°C
Beaker B: Water at 30°C
Beaker C: Water at 50°C
Each beaker has the same amount of water and sugar.
What is the independent variable in this experiment?
8. Look at the illustration below, which shows a chromatography setup. If a scientist wants to investigate how different types of paper affect the separation of ink pigments, what would be the independent variable?
9. The independent variable is the factor that is measured or observed in an experiment.
True
False
10. Changing multiple independent variables at once makes it easier to determine cause and effect.
True
False
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