Question

mary investigated the effect of different concentrations of miracle grow on the growth of tomato plants. she grew four groups of tomato plants (10 plants/group) for 30 days. she then applied miracle grow as follows: group a : 0% miracle grow group b : 10% miracle grow group c : 20% miracle grow group d : 30% miracle grow the plants received the same amount of sunlight and water each day. at the end of 30 days, mary recorded the height of the plants (in centimeters). the independent variable is the dependent variable is the control group is

Explanation:

The independent variable is what is changed in an experiment. Here, Mary varies the concentration of Miracle Grow. The dependent variable is what is measured, which is plant height. The control group has no treatment (0% Miracle Grow) to compare against.

Answer:

Independent variable: Concentration of Miracle Grow
Dependent variable: Height of the plants
Control group: Group A