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Page 39: Test Practice

Exercise 1

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B. One is the experimental group and one is the control group, and together they show the effect of the direction of light.

(Recall that experiments have an experimental group and a control group. The experimental group receives a change in the independent variable. The control group is exposed to the same conditions as the experimental group, but without the change in the independent variable. In this case, both plant groups were exposed to the sunlight. However, for the experimental group, only one side is exposed to the sunlight. We can then see if there were any effects based on the manipulation of the independent variable).

Exercise 2

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D. No, because a theory is a highly reliable explanation that incorporates many well-tested hypotheses.

(It is a first step that her data supported the hypothesis. However, there has to be repeated testing to verify that the plants will grow towards the light source. Additionally, other scientists should replicate her experiment to see if they get the same results. Once the results have been verified as reliable, it can be considered further.)

Exercise 3

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C. No, because a theory is a complex explanation that does not become a law.

Exercise 4

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E. The griffin has no role in biology, because it is not real.

(Recall that we need evidence when examining scientific topics)

Exercise 5

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C. The students used different metric units to state the same height.

(0.65 meters = 65 centimeters)

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Page 39: Test Practice

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