The aim of the investigation is to determine factors affecting the rate of photosynthesis in plants, by using Canadian pondweed and counting the number of bubbles of O2 given out during a minute.
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PLANNING Introduction: The aim of the investigation is to determine factors affecting the rate of photosynthesis in plants, by using Canadian pondweed and counting the number of bubbles of O2 given out during a minute. Variables: As I am going to investigate the effect of CO2 concentration on the rate of photosynthesis, all other factors must be made constant; these include temperature, light intensity, length of shoot and as far as possible, the amount of foliage on each shoot, and the colour (how green) of the shoot. Any major changes in the above could result in a false set of readings. Pilot Studies and Use of Knowledge: A pilot study explaining the effect of light intensity on photosynthesis of Canadian pondweed shows that as light intensity increases, the rate of photosynthesis follows suit. In another pilot study, I found that a similar pattern emerges with rising temperatures. However, after a certain temperature (slightly lower...

