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planning for photosynthesis coursework

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PLANNING Aim: To find out how changing light intensity affects the rate of photosynthesis in pondweed. Prediction: I think that as I change the light intensity the rate of photosynthesis will increase while the temperature will also increase. I will be able to observe this by counting how many bubbles are produced, this happens because during photosynthesis oxygen is a waste product being produced in the air which we can see as bubbles. Preliminary work: I have done some preliminary work in class to predict how I will get my final results. I found out from my preliminary results that as the distance of the lamp is more far away from the pondweed then the average amount of bubbles will decrease and that the temperature will stay constant. I can now see that my prediction for the temperature to increase did not come out true. Now I know what I will be expecting to get out of this experiment I will get a general idea from my preliminary work that I may find trends and patterns that I will get finally in my graphs and how the line of best fit will look like, which then I can compare with my graph that I have done for my final results. ...read more.


and that if the experiment had been done once or twice again will the results be the same or near about the same. Accurate meaning that the results are exactly perfect and that they should not be any mistakes or anomalies. In my range that I have chosen, I have got adequate ranges meaning enough because it gives me something to find out about the rate of photosynthesis during light intensity. When I use these ranges, I shall have different results which then I can plot graphs for and find patterns and trends to help me refer back to my prediction and preliminary work to see if I have got reliable and accurate results. Scientific Research; For photosynthesis to occur a producer is needed at the beginning of the reaction. In this case it must be green plants because they make their own food by photosynthesis and then energy is loss and transformed to the rest of the food chain. The green pants execute this by absorbing the suns light energy by chloroplast contained in their leaves and so can then be converted into glucose which is used in respiration or converted into starch which can be turned back to glucose and used for respiration again. The glucose is also converted to sucrose which is carried in vessels called Phloem vessels to the rest of the plant. ...read more.


The diagram below states what has happened when the electron contributor has come apart. In this process the oxygen release from photolysis is a waste product and the hydrogen binds with NADP to form NADPH2. Apart from water photolysis, it can also happen in the atmosphere where primary pollutants such as hydrocarbons and nitrogen oxides react to produce secondary pollutants such as peroxyacyl nitrates. The two most important photolysis reactions in the troposphere are. 1] O3 + h? � O2 + O1D ? < 320 nm This generates an excited oxygen atom which can go on to react with water to give the hydroxyl radical: O1D + H2O � 2OH The hydroxyl radical is central to atmospheric chemistry as it initiates the oxidation of hydrocarbons in the atmosphere and so acts like a detergent. 2] NO2 + h? � NO + O Is a key reaction in the formation of tropospheric ozone. The formation of the ozone layer is cause by photolysis. Ozone in the earth's stratosphere is created by ultraviolet light striking oxygen molecules containing two oxygen atoms and splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines with unbroken O2 to create ozone, O3. In addition, photolysis is the process by which CFCs are broken down in the upper atmosphere to form ozone-destroying chlorine free radicals. ...read more.

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Response to the question

The Student has set up a clear and well thought out experiment to test the given question/aim. Their response covers all of the nessecary criteria such as different variables and how to controll them, this was something that I found ...

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Response to the question

The Student has set up a clear and well thought out experiment to test the given question/aim. Their response covers all of the nessecary criteria such as different variables and how to controll them, this was something that I found hard to do at first. The plan is well structured and not overly complicated, which can be an issue if when carrying out the experiment the instructions can not be easily read.

Level of analysis

For GCSE this is a very good example of an experiment plan, but from my experiance to get the top grade the author could have explained why each bit of equipment was needed, this may seem a little picky but it will allow you to gain a few more marks. The research that was included at the end of the plan is extensive including both diagrams and equations backing up the written explinations. To improve this plan the student could have explained all of the key terms, this only has to be done once for each term but it shows whoever is marking the work that you understand what you are writing about and you are not just realling it off like a parrot!

The hardest part about planning an experiment is thinking of how to control all of the variables, I am doing A-level biology and in my experiment plans I spend forever thinking of all the variables and how they could be controlled. The fact that the student has recognised that each person should complete their own set task through out the experiment means that they have considered that different people reading results that may be subjective would taint the final results, and by controlling this the experiment will be more VALID.

Quality of writing

There are a few typos within this plan such as missing word off the ends of sentences. Also as this is a scientific experiment plan personal pronouns such as 'I' 'she' 'he' etc. should not be used, when my class did their first plan everyone did this so it is not uncommon . But the scientific language used is relevent and not miss-used. The bibliography included at the end of the plan displays skills that many would not be using untill A-level, and is another reason why the student gained shuch a high mark. Over all this a well thought out plan and includes many of the skills that is needed to gain the higher grades.

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Reviewed by cheekymokeyxxx 03/02/2012

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