Which factor in an experiment does not change or vary?

Which factor in an experiment does not change or vary?

• A. Independent Variable
• B. Control
• C. Constant
• D. Solvent

Answer: (C)

In experiments, you separate what you change, what you measure, and what you keep the same. The factor that does not change across all trials is the constant. Constants are the conditions you keep identical so that the test truly reflects the effect of the variable you’re studying. For example, if you’re testing how different fertilizers affect plant growth, you would vary the fertilizer type (the independent variable) and measure growth (the dependent variable), while keeping things like the amount of water, soil type, light, and time the same. Keeping these factors constant ensures that any observed differences come from the fertilizer, not other influences. A control is a baseline setup used for comparison and is related to constants, but the term that best fits “does not change or vary” is the constant.

In experiments, you separate what you change, what you measure, and what you keep the same. The factor that does not change across all trials is the constant. Constants are the conditions you keep identical so that the test truly reflects the effect of the variable you’re studying. For example, if you’re testing how different fertilizers affect plant growth, you would vary the fertilizer type (the independent variable) and measure growth (the dependent variable), while keeping things like the amount of water, soil type, light, and time the same. Keeping these factors constant ensures that any observed differences come from the fertilizer, not other influences. A control is a baseline setup used for comparison and is related to constants, but the term that best fits “does not change or vary” is the constant.