Question

2 groups of students conduct an experiment to determine whether lettuce plants produce more leaves under red, blue, or green light. the groups collect the following data. chart: group 1 - color of light (green, red, blue), number of leaves (32, 63, 115); group 2 - color of light (green, red, blue), number of leaves (14, 31, 72) which would be an appropriate limitation of the model associated with the different groups regarding the light? a group 1 did not use a control, but group 2 did. b group 1 used repeated trials and group 2 did not. c group 1 had more people on the team than group 2 d group 1 used a brighter light than group 2.

Explanation:

To determine the limitation, we analyze each option:

• Option A: The experiment's goal is to compare leaf production under different lights, so a control (e.g., white light) isn't necessary here as the focus is on red, green, blue. Eliminate A.
• Option B: The data shows number of leaves, not trial repetition. No info on trials. Eliminate B.
• Option C: The table only shows number of leaves, not number of people in each group. No info to support this. Eliminate C.
• Option D: The problem is about light color affecting leaves, but if Group 1's light was brighter, that's a confounding variable (light intensity vs color), limiting the model as we can't tell if color or brightness caused differences. This is a valid limitation.

Answer:

D. Group 1 used a brighter light than Group 2.