Q) A scientist testing the effects of a chemical on apple yield sprays an orchar
ID: 99589 • Letter: Q
Question
Q) A scientist testing the effects of a chemical on apple yield sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall, the number of apples harvested from each orchard is counted. Which of the following variables must be controlled in this experiment?
1.the amount of water that each orchard receives
2. the species of trees in the orchard
3.the number of apples that are produced by each tree
4.the size of each of the orchards
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Q)The control group in an experiment is not exposed to the independent variable.
1.True 2.False
Explanation / Answer
1) The scientist wants to test the effect of chemical on apple yielding of orchards. The first orchard received the chemical and the second orchard did not receive the chemical. In order to find the effect of chemical on the yield of apple, the amount of water that each orchard received and the species of trees in the orchard must be controlled. So, the answer for this question are options 1 and 2.
2) In an experiment, the experimental group is exposed to changes in the independent variable. Control group is not exposed to changes in independent variable. Therefore, the given statement is true.
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