An Analysis and Evaluation of Data from Photosynthesis Experiments

An Analysis and Evaluation of Data from Photosynthesis Experiments

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An Analysis and Evaluation of Data from Photosynthesis Experiments

Graph analysis

This is my analysis for the investigation in to the affect of light
intensity on the rate of photosynthesis to the Canadian pondweed,
elodea. In the results the pattern is that when the light intensity is
higher the readings are generally higher. On the graph the less the
light intensity the lower the gradient of the curve. the equation for
the photosynthesis process is;

CO2 + 2H2O + Light Energy ========> [CH2O} + O2 + H2O,

This shows that when the light intensity is increased the rate of
reaction will be more quicker he only anomalous result there was, is
the one in the 100 watt result the reading after 5 minutes is
anomalous because it does not follow the predicted pattern of
increasing in the production of gas because it is lower

I know from my own knowledge of photosynthesise that when the light
intensity is increased the rate of reaction will be more quicker
because many plants and trees photosynthesise quicker in stronger
light and photosynthesise slower in dimly lit places. The chlorophyll
absorbs light energy and enables it to be used by the plant for
building up sugar. The overall effect is that energy is transferred
from sunlight to sugar molecules. The energy inside molecules is
called chemical energy, so light energy is converted into chemical
energy by the chlorophyll.

I believe that the results are reliable enough to support the
hypothesis, because the graph of results proves the hypothesis because
the gradient of the curve increases with the increase of the light
intensity. I think that the method used is reliable enough to support
the prediction. Overall, both graphs and my results support my
predictions fully. My idea that the rate of photosynthesis would
increase with light intensity was comprehensively backed up by my


I think that the method used in the experiment is not very accurate
because the way we measure the amount of gas produced is not very

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precise, the measuring tube is not the most accurate because it is
possible that a little gas could have been let through the measuring
cylinder, I think a more accurate way to measure would be to use a gas
syringe. Improvements to the method would be to use a smaller time
scale and instead of measuring every five minutes I would measure
every two minutes, another way of increasing the reliability of my
results would be to take more repeat readings and find an average. One
problem, though a small one, is in the time keeping. The main problem
here was in when to begin the minute. If for one reading, the minute
was started just after one bubble had been produced, and in another
reading it was just before, this could have had a negative effect on
the accuracy of my results. One flaw or inaccuracy of the experiment
would be the heat generated by the lamp affecting the plant and making
the rate of photosynthesis quicker. This is because heat has a
considerable affect on the process of photosynthesis. Up to a certain
point, the higher the temperature, and the faster a plant will
photosynthesise. Normally a rise of 10°C doubles the rate, raising
the temperature up to around 40°C increase the rate of photosynthesis
if it gets any higher, photosynthesis slows down and will soon stop
altogether. This is because the heat destroys the enzymes, which are
responsible for the chemical reactions. A way to stop heat affecting
the result would be to stand a block of Perspex in between the lamp
and the elodea which would stop most of the heat and still allow light
to go through. Another problem of the experiment is the amount of
carbon dioxide in the water, to make the experiment a fair test all
plants must have equal amounts of carbon dioxide and enough for the
whole experiment, a way to do this would be to take equal amounts of
potassium hydrogen carbonate and put it with the elodea.

I believe that the anomalous result I identified in the analysis was
cause by an accident in reading and not caused by any of the flaws in
the method, I belive this because the next result follows the right
pattern. overall I belive that the results are reliable because it
follows the hypothesis and everything went as I predicted, but the
results could just be a bit more accurate. I can now conclude that
increase in light intensity does increase the rate of photosynthesis.

If I were to carry my own experiment in to photosynthesis and light,
it would be interesting to see the affect of different lights such as
halogen and neon on the rate of photosynthesis and see if they change
the rate.

Average Results of Volume of Gas Collected at Different Light

Time (mins) light intensities


20 watt

40 watt

60 watt

100 watt















































































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