easy · Enhanced ACT Science
A student investigated how the amount of liquid fertilizer affects the growth of bean plants. She prepared four pots that were identical in soil, sunlight, and watering schedule. Each week she added a different amount of fertilizer to a pot: 0 mL, 5 mL, 10 mL, or 15 mL. After three weeks she measured the height of the stem in each pot.
Which pot is best described as the control group?
- The pot that received 10 mL of fertilizer each week
- The pot that received 0 mL of fertilizer each week
- The pot that received 5 mL of fertilizer each week
- The pot that received 15 mL of fertilizer each week
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