Dh2o Lab

For the controlled dH2O, it was hypothesized that no disks would float. The reason is because there is not enough CO2 for sample organism to absorb to allow it to do so. Looking at Figure 5.1, the slope of the line is y=0. This supports the hypothesis because there are no floating disks. For the 0.2% bicarbonate solution, it was hypothesized that if the leaf disks in this solution were placed under a lamp, then the disks would float. Figure 5.1 supports this claim, as there is an almost linear increase in the amount of floating disks over time. The leaf disks in the bicarbonate solution are exposed to enough light, H2O, and CO2 that they can produce enough oxygen to cause floating. If the 0.2% bicarbonate solution were placed in the dark, then the disks …show more content…
Looking at Figure 5.3, there is a larger amount of floating disks under LED light compared to the “normal” light. This is due to LED light being in the blue region of the visible light spectrum (700-600 nm). Plants are known to absorb light very well in the blue and green wavelength spectrum. However, when the line graph of LED light is compared to the 0.2% bicarbonate sample in Figure 5.1, the LED light sample has a smaller rate of photosynthesis. The control in the group experiment may have failed, which would introduce tremendous error into the analysis of this experiment. Errors that may have occurred in the experiment may be the distance of the lamp to the samples in the group experiment. There may have been a major difference in the distance of the LED lamp and the leaf disks than the normal lamp and the leaf disks that was not accounted for. The farther the lamp is from the leaf disks, the longer it takes for the leaf disks to receive electron energy necessary to carry out photosynthesis; therefore, the time needed to produce enough oxygen to allow the leaf disk to float will