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How does the concentration of Carbon Dioxide affect the rate of photosynthesis?

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How does the concentration of Carbon Dioxide affect the rate of photosynthesis? Aim The aim is to find out by experimenting the effect of changing the concentration of CO2 on the rate of photosynthesis. Background knowledge Before doing the investigation, I have to know about the limiting factors of photosynthesis: Light = To get different supplies of energy levels you need different amounts of light reaching the plant. Stomata = The more surface area on the leave of a plant allows more photosynthesis. Glucose = The amount of glucose can limit how much photosynthesis can be done. Humidity = The amount of photosynthesis is affected by the amount of water and water vapour available in the air. CO2 = The changing CO2 amounts affect the rate as it is a lazy reactant. Fertilisers = They can affect the rate of photosynthesis and are used to replace missing nutrients. The graphs on the next page show what Carbon Dioxide and Fertilisers do to plants. In photosynthesis, green plants need sunlight. They use the light energy to make glucose. ...read more.


The light is placed 15cm away from the beaker to ensure that light doesn't become a limited factor to ensure an accuracy test. There has to be sodium hydrogen carbonate solution in the burette for the experiment to work. We kept all variables the same in the experiment. Prediction From my knowledge of this experiment and my knowledge of this subject, I can make a justified prediction. I predict that when the concentration of CO2 increases, the amount of O2 produced will increase but level out, as too much CO2 will result in the other factors being limited. I can make this prediction because I feel that the more chemicals (reactants) that are present, the more chemicals can be used to produce O2. As I already know from my background knowledge, there are many limited factors for photosynthesis. Therefore I can tell what effects in changing the factors will occur. I however predict from my background knowledge that there will be an optimum point, as the enzymes will denature at an optimum point before levelling off the graph. ...read more.


They noticed the plant dead after 48 hours. It may be because the sodium hydrogen carbonate is an alkali and it is used in baking soda, pharmaceutical products like indigestion tablets and fire extinguishers so that may have killed the plant. If you increase the concentration of sodium hydrogen carbonate it will make the pH of the plant rise. The effect this will have on the plants enzymes is that they will be killed because they will work more rapidly killing themselves more quickly. To get round this problem we should of used a percentage of 2.5% and 4% to work out were the graph falls and to see if it won't of died. I don't think it was ok to average the results for the first 24 hours and the second 24 hours. This is because there weren't another results to average it properly. The method could be improved by doing the results again on own instead of relying on other people to take results. I could do further work in order to give more evidence for my conclusions by doing more research in the books and asking the teacher more. By Leigh Clements 10a/Sc1 ...read more.

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