what is nedded for affection of plant growth such as sunlight and water for science projects?

Answer 1

In addition to sunlight and water:

nitrogen, phosphorus, a pollutant (vinegar, oil, smoke), ultraviolet light, different temperature, different number of hours of light, depth or width of pot, type of potting soil, soil-less medium like vermiculite or perlite, liquid fertilizer vs pelletized time-release fertilizer, air circulation vs covered by a plastic bag, color of light from different colored light bulbs or covering the light with colored plastic film from the florist, growing the plant upright vs putting the pot on its side, watering from the top of the pot vs watering from the bottom, tap water vs distilled water, tap water vs rain water, tap water vs lake water, ...