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Investigate the effect of light intensity on photosynthesis.

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Daniel Roll� Biology Coursework Aim: To investigate the effect of light intensity on photosynthesis. Introduction: This investigation seeks to find a relationship between light intensity and the rate of photosynthesis. Photosynthesis is a chemical reaction occurring in the leaves of green plants. Using the energy from sunlight, it changes carbon dioxide and water into glucose and oxygen, to be used as energy by the plant. Photosynthesis happens in the mesophyll cells of leaves. There are two kinds of mesophyll cells - palisade mesophyll and spongy mesophyll. The mesophyll cells contain tiny bodies called chloroplasts, which contain a green chemical called chlorophyll. This chemical is used to catch the light energy needed in photosynthesis Plants can absorb and use light as an energy source, because plants contain the green pigment, known as chlorophyll, which allows the energy in sunlight to work chemical reactions. The chlorophyll is contained in chloroplasts, and these work as 'Energy Transducers' that convert light energy into chemical energy. Photosynthesis also needs certain conditions to operate in the optimum way these include: * Chlorophyll * Carbon dioxide (from the air) ...read more.


1 10 2 18 3 21 4 28 5 34 Mean number of bubbles: 9 Measurement 5- 25cm Minutes Bubbles 1 0 2 3 3 4 4 6 5 7 Mean number of bubbles: 2.5 Measurement 6- 30cm Minutes Bubbles 1 3 2 7 3 10 4 13 5 14 Mean number of bubbles: 3.5 Measurement 7- 35cm Minutes Bubbles 1 5 2 5 3 6 4 6 5 6 Mean number of bubbles: 2 Average number of bubbles per minute Distance (cm) Rate (bubbles per minute) 5 9 10 4.5 15 4 20 9 25 2.5 30 3.5 35 2 To find out the average number of bubbles per minute: Example: Measurement 2- 10cm Minutes Bubbles 1 13 2 17 3 22 4 26 5 32 The difference between 1 and 2 is 4 The difference between 2 and 3 is 4 The difference between 3 and 4 is 4 The difference between 4 and 5 is 6 Analysis: Our experiment does show that light intensity does have an effect on the rate of photosynthesis. However we did come across some errors in our experiment and these were shown up in our graph. ...read more.


If I had access to any equiptment, I would try to make the whole experiment, computerised and have no human involvement. This would obliterate the main source of error in any experiment or investigation, which is human error. Without human error, our experiment would have been 100% accurate and correct, without any flaws or mishaps. This would help to get rid of error and give us a better, fairer set of results. There are other experiments that we could test our prediction on, and see if it works in all scenarios. Another investigation that could be done is similar to the one tested in this experiment, but on a more natural level. This time we would take two of the same plant and plant them in two different environments: a wooded one and an open one. We could then test them each day for a month to see how much glucose each had produced (this would be done by taking a sample of leaf from the plant). This would show us how light intensity affects photosynthesis in nature. Diagram: This experiment would show us how photosynthesis and light intensity work in nature, and this would give us a more natural, realistic set of results that could be used to back up the primary experiment. ...read more.

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