the owner of an apple orchard is wondering if adding fertilizer to the soil around the apple trees will increase the number of apples that a tree produces each year. To test this, she uses a section of apple trees to the west of her barn. There are fifty trees in that section in total. In the spring, the apple farmer added fertilizer to the soil around twenty-five of the trees. In the fall of that same year, she counted the number of apples that grew on each tree.
1. What is the independent variable in the experiment
2. what is the dependent variable in the experiment
3. name four constants in the experiment
4. what is the controls in this experiment
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Answer:
1. The independent variable in this experiment is the addition of fertilizer to the soil around the apple trees.
2. The dependent variable in this experiment is the number of apples that grew on each tree.
3. Four constants in the experiment could be:
a. The type of apple tree used.
b. The amount of fertilizer applied to each tree.
c. The location of the trees within the section.
d. The time of year when the counting of apples was done.
4. The control in this experiment would be the group of apple trees (the remaining twenty-five trees) that did not receive fertilizer. This group serves as a baseline to compare the effects of adding fertilizer on apple production.