A scientist wants to determine which fertilizer is more effective—Fertilizer X or Fertilizer Y. The best way for her to proceed would be to design an experiment with
A. three groups of plants—a group fertilized by X, a group fertilized by both X and Y, and a control group with no fertilizer.
B. two groups of plants—a group fertilized by Y and a control group with no fertilizer.
C. two groups of plants—a group fertilized by X and a control group with no fertilizer.
D. three groups of plants—a group fertilized by X, a group fertilized by Y, and a control group with no fertilizer.
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Option D
Explanation:
Whenever any experiment is designed it is designed in such a way that it has two groups. One is called the control group which is kept constant in order to observe the change in the experimenter groups.
The experimenter should make 3 groups. One group of plants should be given fertilizer X and other group of fertilizer Y and another group is the control group that is not supplied with any fertilizer.
Then the result is concluded by finding out that which of the two fertilizer is more effective for the growth of the plants.
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