By creating an experimental design I'm guessing you are going to have to design an experiment to test a factor affecting "rates" of photosynthesis, I am pretty sure testing more than one factor will be an error in the experimental design(unless they are conducted as seperate experiments).
Factors affecting photosynthesis:
-Light Intesity
-Wavelength of light(colour of light)
-Carbon dioxide available
-Water available
-Temperature or Heat(increase in rates of enzyme activity and closing of the stomata)
-possibly the presence of inhibitors that prevent enzymes involved in the biochemical pathway of photosynthesis form functioning(not an easy thing to test)
Generally light intensity and/or light colour is the easiest to test and measure.
So you will need to write up an Introduction that defines and provides information regarding photosynthesis and the steps involved aswell as the imprtance of photosynthesis to te ecosystem or environment(converts simple inorganic compound into high energy organic compounds) futhermore the structures of a plants and plant cells involved in photosynthesis should also be explored. Remember that this is science and everything needs to be quick and specific, do not waffle as it will generally cost you marks.
An aim should be provided basically outlining in two or so sentences what your intentions are and reasons for doing the experiment: e.g To use an undestanding of limiting factors and knowlege of the processes involved in photosynthesis to explore the effect of light intensity on the rate of photosynthesis. (Probably need to be more refined and more detailed- I just did that of the top of my head-sorry)
A Hypothesis is needed and should show, within sentence, what you expect to see in the final results. It should also be something measurable and positive: e.g. That increasing light intensity will result in a significantly greater rate of Oxygen production in plants, until another factor becomes a limiting factor and increasing light intensity will have no further impact on rate of photosynthesis.
Now I'm not going to write up a method but it should be in past tense and not use worlds such as I, me, my. Make sure you clearly state the Control, INDEPENDANT variable and Dependant Variable; having a large sample size is also recommended.
The rest comes after completing the experiment but involves recoding data and observations, aperror analysis and discussion and finally the conclusion where you summaries the experiment and state whether the hypothesis was approved or rejected and why.
Hope I haven't missed anything.
Good Luck
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