1. If violet, green, and white lights are exposed to plants, then the violet light will cause the plant to grow taller.
3. The dependent variable would be the plant height because the plant height is not directly changed, but changes because of the independent variable. Or an easier way to think about it is the dependent variable is how you measure the results of the experiment.
4. The data collected would be the effect of different colored lights on plant growth. Basically the effect of the independent variable on the dependent variable.
5. The factors that are controlled are the temperature, the humidity, the amount of water, amount of light, and the types of lights. Basically everything but the dependent variable.