The independent variable is how tall the plant grows and the dependant variable is the colour of light that a plant is taking in. This hypothesis was rejected and the plants grew to be about the same size. The reason different lights do not effect the growth of plants is that the light is not the only thing that a plant needs to grow. They also need water. The saran wrapping paper filters out all the light waves of the visible spectrum except one colour but that does not stop the light from coming in so the plant still gets energy from the light. This means that that the amount of water a plant gets is more important which means that the energy of light that a plant receives does not effect the plant’s growth very much. There were some problems and obstacles while doing this experiment. The first was the location that the plants were going to be placed in since it was winter so outdoors was not a solution. I managed to get a room in the top floor of my house to be the location of this experiment. Another problem was how I was going to water and measure the plants if they were surrounded by saran wrapping paper. The answer to this obstacle was to cut a horizontal slit on the wrapping paper column. With this slit I could easier water the plants and measure them without much of a hassle. Another experiment dealing with the growth of plants is to see what type of fertilizer is most efficient. The hypothesis could be “If the fertilizer is mostly made up organic materials then it will grow stronger, taller and healthier”. Or perhaps whether loud and soft sounds effect the growth of plants? The hypothesis would be “If the sound environment around the plant is loud then it will grow better”. The people doing that experiment could put one set of plants outside under a shelter to prevent rain water from coming in. And they could place another set of plants indoors.