Purpose
To determine if light intensity affects the rate of growth in Brassica rapa.
Hypothesis
If the plant that is exposed to high intensity light grows more, then plants can adapt to absorb more photons for photosynthesis. Eventually, the rate of photosynthesis will top out, and stop increasing, due to the lack of one of the components necessary for photosynthesis.
Background:
Photosynthesis is a process used primarily by plants but sometimes by other organisms to convert light energy into chemical energy that can later be released. This chemical energy is stored in the form of sugar or glucose molecules. Plants then use this energy to grow, they use the CO2 molecules in the atmosphere to create biomatter that they use to grow. Organisms like plants that create their own food are called autotrophs. …show more content…
Light intensity changes throughout the color spectrum. For example, blue light has a tighter wavelength, whereas red light has a longer one. The color spectrum is shown below:
Gamma rays are the shortest wavelength of light that is known, and radio waves are the longest. In my experiment, I used three different lights over three Brassica rapa, or commonly known as Wisconsin Fast Plants. The first light was Blue, since it has a short wavelength. The second light, or my control, is White, which is right in the middle of the visible spectrum. The third light is Red, because it has a long wavelength. I studied each plant's growth over a period of one week. I predicted that the Blue light, which has the shorter wavelength, would grow more than the other plants. I predicted this because as the light intensity increases, both the number of photons and the amount of energy increases. Therefore, more photons would come in contact with the leaves of the plant, which would increase the rate of photosynthesis and the total growth of the