Question

A scientist who wants to study the effects of fertilizer on plants sets up an experiment. Plant A gets no fertilizer, Plant B gets 5mg of fertilizer each day, and Plant C gets 10mg of fertilizer each day. Which plant is the control group?

Answer 1

A control group is the group that has no changes to it. It is the group you would compare the experimental group to to see if there are changes.

So in this case, it is Plant A.

Answer 2

The control group is Plant A  that gets no fertilizer.

In an experiment, a control group is necessary in order to establish the validity of the experiment.

The control group is the group that does not receive the treatment. The treatment in this case is the fertilizer.

So, Plant A is the control group because it got no fertilizer.

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