One idea for a science project about plant cells could be to investigate the effects of different environmental factors on plant cell growth and development.

You could set up an experiment where you expose plant cells to different conditions such as light intensity, temperature, or nutrient availability, and observe how these factors affect cell growth and development.

For example, you could set up different groups of plant cells and expose them to varying levels of light intensity by placing them at different distances from a light source. Measure the growth of the cells over a period of time and compare the results to see if light intensity has an impact on cell growth.

Similarly, you could set up different groups of plant cells and expose them to different temperatures, such as placing them in a warm environment or a cold environment. Again, measure the growth of the cells over time and compare the results to see if temperature affects cell growth.

You could also investigate the effects of nutrient availability on plant cell growth by providing different concentrations of nutrients to different groups of cells and observing the growth patterns.

By conducting experiments like these, you can gain a better understanding of how environmental factors can influence plant cell growth and development.