L1.1.4 Quiz: The Practice of Science
Question 8 of 10
To test how fertilizer affects tomato plants, a farmer divided a field of young
tomato plants into 10 plots of equal size. The farmer then put fertilizer on half
of the plots and no fertilizer on the other half of the plots. Which factor is
being tested in this experiment?
A. Age of plants
B. Kind of plants
C. Brand of fertilizer
D. Amount of fertilizer