Photosynthesis - Biology Practical

Topics: Carbon dioxide, Oxygen, Photosynthesis Pages: 2 (518 words) Published: October 13, 2012
Pattern of Result:
Observation that can be seen from the graph is that the line of best fit for own results and class results increases as the concentration of carbon dioxide increases. Also, the graph shows that the class line of best fit had a faster rate of photosynthesis compared to own group result. It can be seen from the graph that the 2% solution is an outlier.

Discussion and Conclusion:
The theory of photosynthesis is that it converts carbon dioxide and water into glucose and oxygen in the presence of light and chlorophyll. Photosynthesis will not occur if something is missing from the equation such as light, carbon dioxide or water. The rate of photosynthesis is also affected by various factors such as colour of light, temperature, pH, amount of water and carbon dioxide present.

From the practical, the leaf disks that were in the 0% salt solution did not rise from the bottom of the beaker. Therefore, the leaf disk had not undergone photosynthesis as carbon dioxide was not present in the solution. The theory states that photosynthesis will not occur if one of the required material is missing, therefore from the theory it confirmed that the leaf disk did not photosynthesis and rise off the bottom of the beaker.

The leaf disks that were in the 2%, 4%, 6% and 8% had undergone photosynthesis as the leaf disk rose from the bottom of the beaker. From the graph it can be seen that the 2% had undergone photosynthesis the fastest as the 2% solution had the lowest average time compared to the other leaves in the other solution. In theory, the 8% solution should have undergone photosynthesis the fastest. Therefore, it can be concluded that a systematic error had occurred in the practical. The 2% solution was a systematic error as maybe the concentration of the solution was not correct as each groups had the same result. Another factor that could have affected the rate of photosynthesis for the 8% solution is that the leaf disks had started to...
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