Based on the experimental design, which variable was the control?
A. Moisture
B. Seeds in the dark
C. Type of light
D. Temperature
E. Germination rate
Clarify Question
1. What is the key concept addressed by the question?
2. What type of thinking is required?
3. What key words does the question contain and what do they mean?
Gather Content
1. What do you know about experimental design?How does it relate to the question?
Consider Possibilities
1. What other information is related to the question? Which information is most useful?
Choose Answer
1. Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process
1. Did your problem-solving process lead you to the correct answer? If not, where did the process break
down or lead you astray? How can you revise your approach to produce a more desirable result?
B. Seeds in the dark
Clarify Question
1. The question is about designing an experiment.
2. This question is asking you to apply your knowledge of experimental design to identify an appropriate control for an experiment.
3. The hypothesis is that light is necessary for seed germination.
Gather Content
1. Seeds were placed in three conditions, in the dark, artificial light and direct sunlight.
Consider Possibilities
1. Which of the three groups is the control?If you are testing to see if light is necessary for germination then the two conditions exposing seeds to light are not good control groups.
Choose Answer
1. The seeds in the dark are the control group.The other two groups are receiving some kind of light, and this is the hypothesis that is being tested, so these seeds are in the test or experimental group.
Reflect on Process
1. This question asked you to apply your understanding of experimental design to identify the correct
control group for an experiment.If you got the correct answer, great job! If you got an incorrect answer,
where did you get stuck? A control group is what you are comparing your test groups to. Were you
confused that the hypothesis being tested was that light was required for germination?
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