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Investigation To Measure How Temperature Affects The Rate Of Photosynthesis In Water Plants.

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Investigation To Measure How Temperature Affects The Rate Of Photosynthesis In Water Plants Photosynthesis is the method by which plants make oxygen and food (glucose). This is the equation for photosynthesis; Sunlight Carbon Dioxide + Water Glucose + Oxygen Chlorophyll OR Sunlight 6CO2 + 6H2O C6H12O6 + 6O2 Chlorophyll Four things that affect the speed of photosynthesis in plants are; 1. Concentration of Carbon Dioxide 2. Light Intensity 3. Temperature 4. Amount of Water If any one of these factors is not present then photosynthesis will not happen or will happen slower. Trial Experiment In order for us to check that we can do the experiment in this way we will conduct a trial experiment. We will cut a length of pond weed to 10cm and place it in a boiling tube. The end will be cut underwater so that the plant gets no air inside it. We will use a desk lamp to light the plant from 10cm away. ...read more.


The light will therefore be positioned 10cm away from the beaker in all experiments and all other light sources will be blocked off. We will also use a water bath to act as a barrier between the pond weed and the heat from the lamp. Method 1. Set up the apparatus as show in the diagram below. 2. Put 20 cm3 of water in the test tube. 3. Fill the beaker with 500cm3 of water. Use hot and cold water in different amounts to get the water to 20?C for the first experiment. 4. Add the test tube to the water bath. 5. Get 10 cm of pond weed and remove the upper leaves. Then submerge it in the test tube. Then, making sure that it is underwater cut the very end of the pond weed off with scissors. 6. Make sure the pond weed is bubbling. If it isn't then cut the end off again or use a different piece of pond weed. ...read more.


Evaluation The results are quite accurate and the method used proved to adequate for collecting the results. This method could have been improved. For one the light source was only coming from one side. This could have been improved by using more lights and lighting it from every side. Another thing that could have been improved is that the levels of carbon dioxide in the test tube were not kept to a uniform level. Adding sodium hydrogen carbonate to the water could have done this. The evidence wasn't really enough to draw a strong conclusion and support or undermine my prediction. To better this experiment and to further support my prediction I could re-do the experiment at a higher set of temperatures so that I could see if the rate of reaction would slow down above a certain point. It could also be done with a different type of plant to see if what has been proved here is true for all plants. Richard Moseley 07/05/2007 10BC1 Biology ...read more.

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