easy · Enhanced ACT science
A student tested whether Fertilizer X increases the growth of radish seedlings. She planted 20 seedlings in identical pots using the same soil, light, and watering schedule. Ten seedlings received Fertilizer X dissolved in their water, and ten received plain water only. After 14 days she measured the mean height of each set of ten.
Which set of seedlings serves as the control group in this experiment?
- The 10 seedlings that received Fertilizer X
- The 10 seedlings that received plain water only
- The soil that was placed in every one of the pots
- The 14-day growth period used for the seedlings
Sign up free to see the explanation and track your rank →
More Enhanced ACT science practice
- An experimenter tests the effect of different light waveleng… — In this experimental desig
- At any given temperature, the catalyst increases the reaction rate by what factor?
- What is the relationship?
- Which species has a higher population at Year 5?
- Which soil type retains the LEAST amount of water?
- What is the pressure when the volume is 2.0 L?
- If water has a density of 1.00 g/cm³, which liquid will sink in water?
- As the frequency of the waves increases, the wavelength: