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# Variables affecting the rate ofPhotosynthesis.

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Introduction

Variables affecting the rate of Photosynthesis. Planning: Variables: The variables that could change the rate of photosynthesis are: Temperature, light intensity, Co2 concentration and amount and type of weed. The variable I will change is Co2 concentration. The variable that we have changed, Co2 concentration will change the variable we measure in that the higher the concentration of Co2 is the higher the rate of photosynthesis. But at a certain point the rate of photosynthesis will level out and no longer increase. Explanation: It slows due to the law of limiting factors; cause we are increasing the amount of Co2, but the temperature is not going up so this law comes into play eg: If one factor slows all the others slow down after it, its like a factory production line if the person putting the icing on the cake slows the person putting on the cherries has to slow down cause the person putting the icing on is not giving her the cakes so she can put the cherries on. ...read more.

Middle

Method: First we placed a jug full of water on our workbench then we put our thermometer in the water to find our temperature. Then we got our lamp and shone it on the jug and then we put some pond weed in there to weight it down we placed two paper clips on the pond weed and waited for ten minutes for the pond weed to get acclimatized to the water. After this we timed the pond weed for 30 seconds and then put this result down in our table as 0ml of Co2 so many bubbles, then we took this result again and again until we had 4 results for 0ml Co2 and then we used a calculator to find out the average of the whole set of results. We did this for 2ml of Co2; 4ml of Co2 all the way up to 8ml of Co2 all the way through we kept the same pondweed. To add the Co2 we used a syringe to add it to the water this was the easiest way to do it. ...read more.

Conclusion

These odd results were due to fluctuations in temperature and this is very hold to control due to the changing climate so these cannot be helped. Our results are not that accurate and this is due to the equipment that we are using and the conditions we are doing the tests under. We could improve in many different ways but the main one is we should do the test in a blacked out room accept for the lamp shining on the plant this would stop fluctuations in The Light Intensity. The results we collected were reliable enough to support my conclusion but if you wanted to work this out for scientific uses these results would be very unreliable and would be far from the results you would get under controlled conditions. To start of with we could be given more time this would give us the abilitie to black out the room to stop the problems with light intensity fluctuations and also we could use another test tube collect the Oxygen given of by the pond weed then we could measure the amount given of more accurately and thus calculate the rate of photosynthesis easier. ...read more.

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