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). list three constants for this experiment.

Explanation:

Constants are factors kept unchanged across all experimental groups to ensure only the independent variable (Miracle Grow concentration) affects the dependent variable (plant height). From the experiment description, three such factors are: the number of plants per group (10 plants), daily sunlight amount, and daily water amount.

Answer:

1. Number of plants per group (10 plants)
2. Amount of sunlight each day
3. Amount of water each day