Understanding the Independent Variable
This worksheet helps Grade 11 science students understand and identify independent variables in experimental design.
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Understanding the Independent Variable
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Read each question carefully and provide your best answer. This worksheet will assess your understanding of independent variables in scientific experiments.
1. In a scientific experiment, the independent variable is the factor that is deliberately or changed by the experimenter.
2. The independent variable is expected to cause a in the dependent variable.
3. To ensure a valid experiment, all other factors, known as variables, must be kept constant.
4. A scientist is testing how different amounts of fertilizer affect plant growth. What is the independent variable in this experiment?
Plant growth
Type of plant
Amount of fertilizer
Amount of water
5. Which of the following best describes the independent variable?
The variable that is measured
The variable that is changed by the experimenter
The variable that remains constant
The result of the experiment
6. An experiment can have multiple independent variables that are changed simultaneously.
True
False
7. The independent variable is also known as the responding variable.
True
False
8. A student wants to investigate if the temperature of water affects how quickly sugar dissolves. Identify the independent variable in this experiment and explain why.
9. Design a simple experiment to test the hypothesis: 'The amount of light affects the growth rate of mold.' Clearly state your independent variable.
10. Read the following experimental scenario and identify the independent variable:
Scenario: A pharmaceutical company is testing a new drug to lower blood pressure. They administer different dosages (20mg, 40mg, 60mg) of the drug to three groups of patients, while a fourth group receives a placebo. They then measure the change in blood pressure for all groups after two weeks.