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# Investigate The Limiting Factors of photosynthesis.

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Introduction

TOM BAILEY BIOLOGY COURSEWORK INVESTIGATE THE LIMITING FACTORS OF PHOTOSYNTHESIS AIM: The aim of this investigation is to explore how light intensity effects photosynthesis. We will be looking at the light factor and changing it. This will be to increase or decrease the intensity of the light. DIAGRAM: METHOD: - Collect all of the apparatus needed for the experiment - Fill trough and collection tube with water - (Make sure that you are wearing an apron and safety goggles) - Set up apparatus as shown on the above diagram - Place the pondweed in the test tube and add sodium hydroxide - Put lamp in front of the test tube and observe gas produced - Decrease the distance of the lamp from the test tube three times at 10cm changes each time - Do the test three times for each distance We have decided that it is not appropriate to use a gas collection tube in this experiment because not enough gas will be produced. ...read more.

Middle

So as we move away the light, the rate at which photosynthesis occurs will decrease. This is because photosynthesis is most effective when there is light which will make more gas be produced. We can also see this because plants can't photosynthesise at night. RESULTS TABLE TO SHOW THE AMOUNT OF BUBBLES PRODUCED THE MORE LIGHT THERE IS 10cm 20cm 30cm 40cm TEST 1 23 9 3 1 TEST 2 20 8 4 1 TEST 3 25 8 3 2 AVERAGE 22.7 8.3 3.3 1.3 CONCLUSION: In my experiment, I found that increasing the temperature of the acid did speed up the rate of reaction between the hydrochloric acid and magnesium. As the temperature increased, the reaction became quicker. So my hottest experiment at 60oC was my fastest, and my coolest experiment at 21oC was my slowest. ...read more.

Conclusion

We did four distances from the pondweed with the lamp during my experiment and I think that it would have been better to do five maybe. I do not think that four was a sufficient amount. The repeat results that we got were all accurate and the range of results was no too far above or below the others. My plan was well done but I had to change it because I was told that the gas collection tube would be too big and there would not be enough gas collected to show up which was correct in the end. We didn't have any serious problems really and it was all well thought out and well done. If I was to do this experiment again, then I would definitely use a gas collection tube and make it last a lot longer so there would be more gas produced. I may also use a wider range of distances so it would be a more accurate graph. ...read more.

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