Suzie Q wants to know the effect of different colors of light on the growth of plants. She believes that plants can survive best in white light. She buys 5 ferns of the same species, which are all approximately the same age and height. She places one in white light, one in blue light, one in green light, one in red light and one in the closet. All of the ferns are planted in Miracle-Grow and given 20 mL of water once a day for 2 weeks. After the two weeks, Suzie observes the plants and makes measurements. Hypothesis: If, then Independent Variable: Dependent Variable: Control Group: Constants:

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The hypothesis to this question is as follows: If a fern is exposed to white light, then it would grow taller.Independent variable: different colors of light Dependent variable: growth (height) of plants/fernsControl group: plants/ferns placed in the closet (no light)Constants or Control variable: Miracle-Grow, 20ml of water, 2 weeks Hypothesis of an experiment is a testable explanation given to support the experiment. Based on the experiment conducted by Suzie in order to determine the effect of colors of light on plant growth, she is of the belief that plants grow/survive best under white light. Hence, the hypothesis of the experiment will be: if a fern is exposed to white light, then it would grow taller. Independent variable of an experiment refers to the variable that the experimenter controls or manipulates in order to effect a change. In this case, the independent variable is the different colors of light. Dependent variable is the variable that is measured or responds i.e. the outcome. In this case, the growth/height of the plants is the dependent variable. The control group in an experiment is the group that receives no experimental treatment. In this case, the group of ferns placed in the closet/no light are the control groups. Control variable or constants are the variables in an experiment that are unchanged or kept constant throughout the experiment. In this experiment, the constants are miracle-grow, Same amount of water (20ml), same amount of weeks (2 weeks).

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