Scientific Investigations
Prior to starting their science fair investigations, the students in Mrs. Hensley's biology class are required to submit a summary of
their experimental designs. One student submitted the following:
• Hypothesis:
Fertilizer X increases fruit production in tomato plants.
Two tomato seeds will be germinated at the same time.
Each germinated seed will be placed in a separate 500 mL container.
• Procedure:
• Exactly 500 g of soil will be added to each container, and the germinated seeds will be placed 1 cm below the surface.
20 g of Fertilizer X will be added to one plant.
Og of Fertilizer X will be added to the second plant.
Each plant will receive the same amount of water and light each day.
• After 60 days, the total number of tomatoes produced by each plant will be counted
The teacher identified a problem with the procedure and asked the student to revise the method. Which of the following is a problem
with the student's procedure?
OA. The procedure is missing a control.
OB. The procedure includes too many independent variables.
OC. The procedure is lacking multiple trials.
OD. The procedure includes too many dependent variables.
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