what are controls in an experiment

A control in an experiment is the baseline used for comparison, so you can tell whether the thing you changed actually caused the result. It helps isolate the effect of the independent variable by keeping everything else the same.

Quick Scoop

In simple terms, if you test a new fertilizer on plants, the control group might get no fertilizer or a standard fertilizer, while the experimental group gets the new one. If both groups grow differently, the control helps show whether the new fertilizer made the difference.

Key Idea

• Independent variable : what you change.

• Dependent variable : what you measure.

• Control : the comparison point that stays the same or gets the standard treatment.

Why It Matters

Controls make experiments more trustworthy because they reduce confusion from outside factors. Without a control, it is much harder to know whether the result came from your test or from something else.

If you want, I can also give you a one-sentence definition or a kid- friendly example.