A phyloGENETIC tree is not the same thing as a taxonomic tree, which is what Cal described. rRNA and molecular studies are used in phylogenetics to determine relations between species.
1 As the light intensity increases, the rate of photosynthesis increases. 2  However, the rate will not increase beyond a certain level of light intensity. 3  At high light intensities the rate becomes constant, even with further increases in light intensity, there are no increases in the rate.
View Full Document. Factors Affecting Photosynthesis Pre-Lab: How do the following variables affect photosynthesis rate? ï· Light Intensity: The more intense the light, the quicker the plant will be able to produce oxygen gas, ATP, and NADPH. If light is not intense enough, photosystem II may be limited in how many reactions take place due to lack of energy. However if intensity is too high, the plant may be heated resulting in too high of a temperature. Therefore an optimal light intensity should exist.