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Investigating the factors, which affect the rate of photosynthesis in a pond plant.

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Investigating the factors, which affect the rate of photosynthesis in a pond plant Aim: To see how light intensity can affect the rate of reaction in the photosynthesis of a plant. Introduction: The following experiment which has been tested continually to produce a fair and accurate set of results. The investigation has brought about the key factors that affect a Canadian Pond plant and how the rate of Photosynthesis changes and varies. Photosynthesis is a chemical reaction occurring in the leaves of mostly green plants. Using the energy from sunlight, it changes Carbon dioxide into water and Oxygen. Oxygen is given off in this reaction as a waste product. This is ideal for us humans, as we need oxygen to survive, and this is why it's vital for the wellbeing off the trees. The way this will be performed is that, a lamp will be set up along a meter rule to make a precise distance, and it will be set up at a chosen set of distances say for example 10 cm. This will determine how distance of light could affect the rates of photosynthesis. The Canadian pondweed is only suitable as are all things in certain conditions like the human body all have working conditions, the pondweed likes warm water at about 30degrees C. ...read more.


Therefore, photosynthesis occurs faster when more heat and light energy is available. The results are still very much inconclusive due to the lack of results you can't determine a line of best fit. Preliminary Evaluation: If this experiment were to be performed again more oxygen would have to be collected and then measure the amount. In this experiment the light intensity reading would have to have been made thorough. Prediction: From the preliminary work I can say that light intensity affects the rate of reaction in photosynthesis. The closer the plant is to the light the faster and more affective photosynthesis will take place. The preliminary was of quite a lot of help leading into the final. It gave an insight into what to expect and they're always good to find more efficient means of performing the experiment, you can alter things in order to provide fairer results. You can then compare results of preliminary to the final results. Materials: The materials that were used to carry out and maintain a fair test in each experiment were: o Light sensor o Lamp o Pond weed o Boiling water o Sodium carbonate o Test tube o Beaker o Meter rule Method: 1) First of all get out all equipment needed for experiment to test rate of photosynthesis. ...read more.


This shows obvious results and the prediction proven right. This is because the closer the plant was to the lamp the higher the intensity, this caused the particles to move more fiercely as there was more energy provided. We did three trials for each experiment to make sure we were carrying out the experiment accurately; you can compare the results to see the results were mainly consistent in all three. In some of them, the variables could have differed slightly due to human error changing the results hence the anomalies. This proves that the prediction is correct as when one of the variables of each experiment changes so will the other causing different results. This will happen due to the particle theory. The particle theory will affect one of the variables so this will also have an impact on the other variable as old bonds are being broken and new ones are being made. The first and second trials of each experiment show that there was quite a difference between the number of oxygen bubbles produced. This could be due to inaccurate counting or inaccurate conditions. Next time I would use distances that were not as far apart. E.g. 5cm. This is because you wouldn't have such a range of results to compare and you could see there would be less of a difference to the results. ...read more.

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