easy · Enhanced ACT science
A student tested whether a liquid fertilizer affects the height of bean seedlings. She grew 10 seedlings in identical pots using the same soil, light exposure, and daily watering. Five pots received 5 mL of fertilizer each day, while five pots received no fertilizer. After 3 weeks she measured the height of every seedling.
Which group of pots serves as the control in this experiment?
- The five pots that received 5 mL of fertilizer daily
- The five pots that received no fertilizer at all
- All ten pots once they were measured at 3 weeks
- The pots that grew the tallest seedlings overall
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