A scientist wants to determine whether fertilizer makes tomato plants grow bigger. The scientist puts 5 grams of fertilizer on the first of 3 tomato plants, 10 grams of fertilizer on the second one, and 15 grams of fertilizer on the third. Each plant receives the same amount of water and sunlight. After 2 weeks, the first and second plants have grown 6 inches, and the third plant has grown only 5 inches.
A) Amount of water each plant receives.
B) Amount of fertilizer each plant receives.
C) Number of tomato plants.
D) Time duration of the experiment.
Which of the following is a controlled parameter of the following scenario?
The controlled parameter is the one thing that does not change in the experiment. So as others have mentioned, the answer is B.
Reply:fertilizer
Reply:"B"
The amount of fertilizer is the controlled parameter.
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