Praxis Biology 5236 Practice Questions - Praxis Biology Content Knowledge (5236) Exam

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A student sets up an experiment testing whether light intensity affects algae growth rate. She uses three tanks: one in bright light, one in dim light, and one covered in foil. Which tank is the control group?

The bright-light tank, because it represents the ideal growth condition The dim-light tank, because it is in the middle of the range tested The foil-covered tank with no light, because it establishes baseline growth without the tested variable All three tanks equally serve as controls for each other

Correct Answer:

The foil-covered tank with no light, because it establishes baseline growth without the tested variable

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