Question

available: sep 2, 2025 12:00am until sep 15, 2025 11:59pm
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scientists must design a controlled experiment to determine the effect fertilizers have on cyanobacteria growth.
select the statement(s) that accurately describes the dependent variable in the controlled experiment.
the factor that is measured or observed.
the factor that will change in response to the test variable.
in this study, the dependent variable is the growth of the cyanobacteria.
in this study, the dependent variable is the type of fertilizer used.
the factors that are kept constant.

Explanation:

1. Understanding Dependent Variable: In an experiment, the dependent variable is what is measured/observed (it depends on the independent variable).
2. Analyzing Each Option:

• "The factor that is measured or observed": Correct, as dependent variable is the outcome we measure.
• "The factor that will change in response to the test variable": Correct, since it responds to the independent (test) variable.
• "In this study, the dependent variable is the growth of the cyanobacteria": Correct, because we measure cyanobacteria growth (dependent) based on fertilizer (independent) changes.
• "In this study, the dependent variable is the type of fertilizer used": Incorrect, as fertilizer type is the independent (test) variable.
• "The factors that are kept constant": Incorrect, these are controlled variables, not dependent.

Answer:

• The factor that is measured or observed.
• The factor that will change in response to the test variable.
• In this study, the dependent variable is the growth of the cyanobacteria.