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Investigate the effect of light intensity and the colour of light on the rate of photosynthesis of Elodea.

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Introduction

Science course work-photosynthesis Aim: to investigate the effect of light intensity and the colour of light on the rate of photosynthesis of Elodea, (Canadian pondweed), to do this, I placed a piece of Canadian pondweed in varying light intensities, and observed the amount of oxygen being given off. I used Canadian pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in water. Apparatus: to do this experiment I will be using the following equipment... 1) 60 -watt bench lamp 2) Canadian pondweed, (well illuminated prior to the practical) 3) Colour filters- red, yellow, green, blue x 1mm thickness 4) 500ml beaker 5) Glass funnel 6) Blue-tack (to hold the glass funnel from the base of the beaker) 7) Stop watch 8) Test tube 9) Top pan balance 10) Spatula 11) Metre ruler 12) Thermometer 13) Clamp stand to hold colour filters in place 14) Sodium hydrogen carbonate 15) Pair of scissors 16) 15cm ruler 17) Glass rod 18) Bucket of water of immersion 19) Detergent (washing up liquid) Prediction: I predict that as the light intensity increases so does the rate of photosynthesis. ...read more.

Middle

However, there will be a point at which the enzymes denature. The temperature will be at room temperature during the experiment because Independent factors: I will change these factors... * Colour * Intensity or the strength of the light * The distance Dependent factors: * No. Of oxygen bubbles counted for 5 minutes * Which will give you the rate of photosynthesis Input variables - light intensity is to be varied by increasing and decreasing the distance from the light source to the plant Output variables - volume of oxygen produced (rate of photosynthesis) is to be measured by finding the volume of oxygen produced in a minute, and therefore finding the rate of photosynthesis Control factors: these factors cannot be changed during the experiment... * Heat * Water * Carbon dioxide * Plant * Same amount of chlorophyll * Light The action spectrum of photosynthesis is the relation usefulness of different wavelengths of light, and in result, one of the three will happen. Energy is dissolute as heat. The energy may be release immediately as a longer wavelength; Energy may set off a chemical reaction, as in photosynthesis. ...read more.

Conclusion

Also because is hard to get stop on count the number of bubbles, the right method would be one where one could find the absolute volume. In addition, an entire species of plant could be tested and see if the results are similar for every type. Different chemicals could be used in the water each time to see which chemicals result in the greatest rate of photosynthesis. Nevertheless, I think the method is quite accurate, because the result table shows us the number that was used for the green filter were very low, and that makes my prediction accurate as well. On the other hand, the number that was used for the green filter that is shown on the white filter colour is quite high. Over all, the entire result table shows us that there is a pattern in the graph, and that it steadily decreases rapidity. The result does fit the pattern, because it shows the shorter the distance, the more white and red light, and the higher the temperature, the better the photosynthesis, because there were more bubbles for white and red colours. There are no anomalies in this result table because all the points go through their line of best fit, and all go through as they were predicted. Hawa Mohamed-11x2 2 ...read more.

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