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Photosynthesis GCSE Coursework

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Photosynthesis GCSE Coursework Aim: To investigate how much light intensity affects the rate of reaction. Reaction: photosynthesis of Canadian pondweed (Elodea) Introduction- what is photosynthesis? The definition of photosynthesis is when plants process water and carbon dioxide to produce glucose by the process of photosynthesis. Photosynthesis is the method that plants use to make their own food. When photosynthesis takes place, plants use the suns energy to combine carbon dioxide from the air with water from the soil to create glucose (a carbohydrate). Carbon dioxide+ water (+light energy)> glucose + oxygen (Simple raw materials) (Carbohydrates food) (By-product) Mostly photosynthesis takes place in leaves, as leaves are photosynthetic organs they make food. Chloroplasts in the leaf cells has got green pigment chlorophyll, it absorbs light energy, making it available for photosynthesis. Plants use glucose to provide energy and raw materials. Glucose can be built into starch, which is a food store, or into cellulose for cell walls. ...read more.


Fair test- to ensure that a fair test is carried out the following things must be done. The same pondweed must be used every time we change the light distance. Do the experiment three times for each distance to get an accurate average. There must only be one variable and that is the distance of the light source from the plant. Choose a value for carbon dioxide mixture and keep at the same value all the way through the experiment. Take results after three minutes for each individual experiment. Safety- Follow lab safety rules (e.g. no running bags at the back etc.) Keep the desk lamp away from contact with water Be careful when using scapular. Method- 6 step-by-step instruction guide of how I'm going to carry out my investigation. 1. Place down meter ruler 2. Get lamp and heat shield 3. Get clamp and hold glass heat shield in place 4. ...read more.


Prediction: I predicted that as the intensity of light would increase and also the rate of photosynthesis would increase. My hypothesised is that if the light intensity increase and the rate of photosynthesis will increase at a proportional rate until am certain level is reached, and the rate of increase will then go down. The level will eventually will be reached where an increase in light intensity will have no further effect on the rate of photosynthesis, as there will be another limiting factor, in this case probably temperature. Results- Temperature: __c Light intensity Gas produced (mm) Distance from the lamp (cm) Reading1 Reading 2 Reading 3 Average 5 8.0 7.5 7.8 7.76 10 6.0 6.2 6.4 6.2 15 4.2 5.1 5.0 4.7 20 3.0 3.2 3.3 3.16 25 2.1 2.5 2.2 2.26 30 1.0 0.7 0.8 0.83 Conclusion: from my results and graph I can conclude that the further the lamp is from the elodea the less gas is produced. The first 10cm it drops from 8 to 6mm, that's 2mm decrease, the pattern is the line going more downer by the mm when the cm is rising. ...read more.

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