Ronald wants to know how different colors of light affect the growth of plants. He
believes that plants can survive the best in white light. He buys 5 ferns of the same
species, which are all approximately the same age and height. He places one in white
light, one in blue light, one in the 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, Ronald observes the plants and measures them.
a. What measurements could Ronald make to determine how different colors of light
affect the growth of plants?
b. What is the independent variable?
c. What is the dependent variable
d. What was the control group in this experiment?
e. List 3 variables that should be held constant in this experiment?
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Answer:
A.he wants to survive the best white light
B.5
C.2
D.25
E.One blue light,One green light,One red light and One closet