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Effect of Light intensity on the Anaerobic Respiration of Pygmy Chain Sword

Extracts from this document...

Introduction

Extended Essay Research Question: What is the effect of decreasing light intensity on the photosynthesis rate of Echinodorus tenellus within a twenty four hour time period? Subject: Biology Supervisor: Mr. Van Wijk Candidate Name: Darryl Soh Candidate Number: 002786 - 030 Table of Contents 1. Abstract.........................................Page 2. Introduction....................................Page 4 3. Equipment /Apparatus........................Page 7 4. Method / Procedure...........................Page 8 5. Results..........................................Page 10 6. Analysis and Evaluation......................Page 33 7. Conclusion..................................... Page 36 8. Bibliography....................................Page 38 Abstract The process of altering the amount of photosynthesis a plant carries out can be altered using an external light source or stimulus. In this essay, the effect of the intensity of external light on the rate of photosynthesis is carried out and investigated through a series of experiments. Firstly, the Pygmy Chain Sword plant was placed in normal sunshine, with a light intensity of 2.62 lux, and the rate of photosynthesis was monitored (measured by the amount of dissolved oxygen in the water) for one day to see how much dissolved oxygen was produced in normal conditions of light intensities. Then, the plant was exposed to 24 hours of constant light at a normal intensity of 2.62 lux to see the concentrations of dissolved oxygen in the water throughout the 24 hour time period while monitoring the light intensity with a lux meter to see if the amount of the dissolved oxygen had been increased or decreased due to the light exposure. The experiment was then repeated three times at each light intensity, and the results were averaged to gain a better range of data. The experiment was then repeated using different light intensities to see the affect of light intensity on the amount of dissolved oxygen produced by the aquatic plant. The results of the experiment showed that despite some inaccuracies or fluctuations in the dissolved oxygen concentrations or the light intensity readings, the amount of dissolved oxygen produced by the Pygmy Chain Sword decreased with decreasing light intensity. ...read more.

Middle

/ 3 = 3.676800 mg/L Graph 3 Table 4 Experiment at light intensity of 1.31 lux Run One Run Two Run Three Average Results Time (s) Dissolved Oxygen (mg/L) Light Intensity Dissolved Oxygen (mg/L) Light Intensity Dissolved Oxygen (mg/L) Light Intensity Dissolved Oxygen (mg/L) Light Intensity 0 2.7686 1.31 2.7698 1.31 2.7603 1.31 *2.766233 1.31 60 2.7652 1.31 2.7689 1.31 2.7669 1.31 2.767000 1.31 120 2.7682 1.31 2.7617 1.31 2.7576 1.31 2.762500 1.31 180 2.7687 1.31 2.7673 1.31 2.7693 1.31 2.768433 1.31 240 2.7673 1.31 2.7687 1.31 2.7698 1.31 2.768600 1.31 300 2.7585 1.31 2.7682 1.31 2.7605 1.31 2.762400 1.31 360 2.7693 1.31 2.7585 1.31 2.7601 1.31 2.762633 1.31 420 2.7607 1.31 2.7693 1.31 2.7687 1.31 2.766233 1.31 480 2.7686 1.31 2.7593 1.31 2.7658 1.31 2.764567 1.31 540 2.7556 1.31 2.7605 1.31 2.7689 1.31 2.761667 1.31 600 2.7675 1.31 2.7607 1.31 2.7657 1.31 2.764633 1.31 660 2.7607 1.31 2.7657 1.31 2.7675 1.31 2.764633 1.31 720 2.7668 1.31 2.7612 1.31 2.7593 1.31 2.762433 1.31 780 2.7614 1.31 2.7691 1.31 2.7688 1.31 2.766433 1.31 840 2.7691 1.31 2.7608 1.31 2.7614 1.31 2.763767 1.31 900 2.7613 1.31 2.7688 1.31 2.7668 1.31 2.765633 1.31 960 2.7665 1.31 2.7668 1.31 2.7689 1.31 2.767400 1.31 1020 2.7608 1.31 2.7682 1.31 2.7578 1.31 2.762267 1.31 1080 2.7646 1.31 2.7689 1.31 2.7584 1.31 2.763967 1.31 1140 2.7672 1.31 2.7603 1.31 2.7691 1.31 2.765533 1.31 1200 2.7657 1.31 2.7593 1.31 2.7631 1.31 2.762700 1.31 1260 2.7667 1.31 2.7613 1.31 2.7608 1.31 2.762933 1.31 1320 2.7689 1.31 2.7608 1.31 2.7657 1.31 2.765133 1.31 1380 2.7673 1.31 2.7616 1.31 2.7658 1.31 2.764900 1.31 1440 2.7585 1.31 2.7667 1.31 2.7585 1.31 2.761233 1.31 Example of Calculations *(2.7686+ 2.7698+ 2.7603) / 3 = 2.766233 mg/L Graph 4 Table 5 Experiment at light intensity of 0.88 lux Run One Run Two Run Three Average Results Time (s) Dissolved Oxygen (mg/L) Light Intensity Dissolved Oxygen (mg/L) Light Intensity Dissolved Oxygen (mg/L) ...read more.

Conclusion

This is because, with increasing light intensity, more light would be accepted by the thylakoid membranes within the chloroplasts in the leaves of plants, as the leaves absorb the red and blue spectrums of white light. The light energy harnessed from the sun, or an artificial light source, can then be used to reduce substances such as water and convert carbon dioxide into organic compounds, form Adenosine Triphosphate (ATP), and as a consequence, have oxygen released as a waste gas. Therefore, since with increasing light intensity, there is more energy for the plant to harness and use to convert inorganic compounds into organic compounds and oxygen, so the amount of dissolved oxygen produced by the Pygmy Chain Sword Plant increases when the light intensity it is exposed to increases as well. Although the experiment did have some significant weaknesses, there is room for some improvements and modifications in the method in which the experiment was carried out, such as by increasing the number of experimental Pygmy Chain Sword plants, the number of times the experiments were carried out, and by testing the plant at a wider range of light intensities. These improvements and modifications in the method could allow for more accurate and reliable results to be obtained in order to confirm my conclusion that increasing light intensity over a twenty-four hour time period increases the rate of photosynthesis. Further development of this basic experiment on a more in-depth, professional level, such as an investigation into the other factors affecting the rate of photosynthesis like temperature and the color of light, would give us a better understanding of the process of photosynthesis and the factors which control and determine the rate of which photosynthesis occurs. More advanced research on the effects of light on rate of photosynthesis would especially aid scientists in developing ways to help control the production of the greenhouse gas carbon dioxide by increasing the rate at which photosynthesis occurs. ...read more.

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