The best question that could be answered from the observations of plant and animal cells in a solution is:
Does a cell wall prevent the plant cell from bursting in a hypotonic solution?
This question directly relates to how the presence of a cell wall affects the osmotic behavior of plant cells compared to animal cells, particularly under hypotonic conditions where water enters the cells. The observations would likely provide insights into whether the cell wall provides structural support that prevents the plant cell from bursting due to increased internal pressure from water uptake.