Variables Question?

To test the hypothesis that plants grow faster in green light, a student set up 3 of the same type of plants. She placed the first plant under a green light, the second plant under a regular light bulb, and the third plant under a red light.



What is the independent variable in this experiment?



A) pot size

B) light color

C) plant type

D) amount of water





Is it plant type (C)? Because It never changes?Variables Question?B) light color is the independent variable.



The independent variable is always the one which is controlled and varied by the experimenter.

The dependent variable is the one measured - in this case the growth of the plants.



To insure a fair test, a good experiment has only one independent variable. As the scientist changes the independent variable, he or she observes what happens.



In your experiment A),B) %26amp;C) should all be kept constant to ensure a fair test.
Variables Question?
The independent variable is the variable is also known as the %26quot;manipulated%26quot; variable. It is the variable that is being manipulated or changed by the experimenter. In this case it would be B) light color.



A variable is something that tends to change or vary. The plant type never changes in this experiment so it is not a variable in this particular situation.

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