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.
At high light in-. tensities, however, an increase in temperature or CO. 2. concentration greatly accelerated photosynthesis. Black-. man concluded that photosynthesis consists of an initial. set of what he called âlightâ reactions, that are largely in-. dependent of temperature, and a second set of âdarkâ re-.