To determine the effect of color of light on plant growth, 4 groups of bean plants were grown under the light conditions below. Group 1—under red light Group 2—under green light Group 3—under violet light

To determine the effect of color of light on plant growth, 4 groups of bean plants were grown under the light conditions below.

Group 1—under red light Group 2—under green light

Group 3—under violet light Group 4—in normal, white light

Which of the variables below should be held constant?

Options:

The color of light each group of plants receives

All of the above

How much each plant grows

The amount of light each group of plants receives

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To determine the effect of color of light on plant growth, 4 groups of bean plants were grown under the light conditions below. Group 1—under red light Group 2—under green light…

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