Biology / Unit 1 Bio 0021 short lesson, about 20 seconds
Control Group
Captions available
The idea
A control group matches the experimental group in every respect except the one variable being tested.
In practice
One wilting plant gets loosened soil; a second, otherwise identical wilting plant keeps its compacted soil untouched.
Where people slip
Without a control, an improvement could come from the season changing, not from the plant's treatment.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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