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) Time duration of the experiment.
Which of the following is a controlled parameter of the following scenario?
First: Pay attention in class, this is stuff they teach in 7th grade.
Second: the answer is likely A because that's what the experimenter is 'controlling' but it's a very poorly worded question. The common verbage used is 'dependant' or 'independant' variables.
I'm assuming that your teacher is either ignorant or very mean. Either way, my condolences.
Reply:Probably B
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