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Photosynthesis And Factors Affecting It.

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Introduction

Biology Coursework: Photosynthesis And Factors Affecting It Niall O'Connor Introduction: Green plants make their own food by the process of Photosynthesis. Four things are needed for photosynthesis to occur in the cells of green plants, light from the Sun, carbon dioxide which diffuses from the air, water from the soil and chlorophyll from the leaves of the plant. Photosynthesis produces glucose, which is used for biomass and energy and oxygen, which is released into the atmosphere. The Word & Symbol Equation For Photosynthesis: Carbon Dioxide + Water Glucose + Oxygen 6CO2 + 6H20 C6H12O6 + 6O2 Scientific Knowledge: Effect of Temperature: (Graph from Lonsdale science revision guide) Temperature can be a limiting factor upon photosynthesis as the rate of photosynthesis rises as the temperature rises. However once the temperature reaches 45 C, the enzymes controlling the photosynthesis become denatured and so photosynthesis is stopped. Effect Of Carbon Dioxide Concentration: (Graph from Lonsdale revision guide) The rate of photosynthesis will rise as the carbon dioxide concentration increases, up until a certain point where the concentration of carbon dioxide will no longer be a limiting factor. Effect of Light Intensity: (Graph from Lonsdale revision guide) ...read more.

Middle

The experiments will be repeated at least twice, as this will create a fair average. Safety will take major consideration, for example the use of goggles and being aware of the fact that the Bunsen burner can cause injury. All of the factors, which are not being investigated, will be kept constant to ensure fair testing. (Picture from Lonsdale Revision Guide) Apparatus: (as labeled on diagram) + A stopwatch + Varying amounts of Bicarbonate Soda + Goggles Results: Amount of Bicarbonate Soda in Spatulas Amount of bubbles produced in 1 min 1/4 42 1/2 53 3/4 58 1 64 1 1/4 70 Evaluation of Preliminary: (How the experiment could be improved) Use a measuring cylinder to measure how much volume is lost to oxygen produced instead of counting bubbles as this is more accurate and the results are more reliable. Conclusion of Preliminary: From my preliminary I can conclude that 1/2 of a spatula of Bicarbonate Soda will be added in my main experiment to speed up the reaction. Finally in my real experiment I will repeat my experiment to back up my results. Aim: To find out how temperature affects photosynthesis Prediction: Temperature can be a limiting factor upon photosynthesis as the rate of photosynthesis rises as the temperature rises. ...read more.

Conclusion

Evaluation: If we are to look again at how I carried out this experiment (See paragraph headed "How will I carry out my investigation") it would seem that the evidence I have accumulated is very reliable. It is sufficient enough evidence to support my conclusion but my experiment could have gathered much more reliable evidence by making a few changes. For example instead of counting the amount of bubbles produced I could have used a measuring cylinder to find the volume of water that was lost to 02 production. I could have extended the experimentation period from 1 minute to 2 or 5 minutes. Finally I could have checked my experiment more by repeating my experiment more often, 5 times instead of 2. Temperature can be a limiting factor upon photosynthesis as the rate of photosynthesis rises as the temperature rises. However once the temperature reaches 45 C, the enzymes controlling the photosynthesis become denatured and so photosynthesis is stopped. The rate of photosynthesis will rise as the carbon dioxide concentration increases, up until a certain point where the concentration of carbon dioxide will no longer be a limiting factor. The rate of photosynthesis will rise as the light intensity increases, however once a certain point is reached light intensity will no longer be a limiting factor. By Niall O'Connor, Cardinal Vaughan Memorial School ...read more.

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