4.1 Key Findings
From the data we collected, it was clear that white light was most effective among the tested lights for photosynthesis in Cabomba, as shown in the results. However, white is a mixture of all the other colours. Thus, we can conclude that blue allows the plant to photosynthesize more than all the other colours besides white.
We have also found out that the wavelength of the tested lights is directly proportional to the amount of oxygen produced by the plant, with an exception of green as green light is reflected off of the plant as the chlorophyll is the same colour variation.
Amber light was the only light found to produce the lesser oxygen despite its greater wavelength as compared to Red, Blue and Purple (red+blue).
We came to the conclusion that since white light contains most of the wavelengths of light, thus it should have the highest photosynthesis rate effect on the plants as compared to individual spectral lights. However, we consider blue light that have the highest photosynthesis rate effect on the plants for an individual spectral light.
4.3 Evaluation of Hypothesis
Our hypothesis "Our hypothesis is that white light will allow the plants to photosynthesise the most as white light consist of a various different colours and their wavelength ranges from 395mm to 700mm" We can conclude that our white light is the most effective light for photosynthesis and that our is hypothesis correct, as white light produced the most amount of oxygen.
4.4 Areas of improvement
Our experiment could have been even more accurate if we left the setup for 48hours instead of 24hours as more bubbles would be produce for more significant differences.
We could have found another way of measuring the depth of the oxygen bubble instead of only using a ruler to see how low the bubble reached in the test tube.
Besides that we could also try out many other different wavelengths of lights which we did not experiment on this session.