• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15
  16. 16
    16
  17. 17
    17
  18. 18
    18
  19. 19
    19
  20. 20
    20
  21. 21
    21
  22. 22
    22
  23. 23
    23
  24. 24
    24
  25. 25
    25
  26. 26
    26
  27. 27
    27
  28. 28
    28
  29. 29
    29
  30. 30
    30
  31. 31
    31
  32. 32
    32
  33. 33
    33
  34. 34
    34
  35. 35
    35
  36. 36
    36
  37. 37
    37

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.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Misc section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Misc essays

  1. The Effect on Music in the Christian Church

    Music history begins with instruments." According to Kenneth W. Osbeck in The Ministry of Music, "The Greeks made extensive use of music religious rituals and also ascribed to it an influence over the moral and emotional nature of man and credited its origin to their gods. In his writings concerning music, Plutarch says: "The right moulding of ingenuous manners

  2. Comparing and Contrasting Envy and Deception in Shakespeares Much Ado About Nothing and Othello

    Emilia then picked it up and handed it to Iago, who now has vital evidence to present. Othello was in the presence of Desdemona when she dropped it and so he should be aware of his. However, because he is so convinced that she is cheating on him, he believes Iago when he says that Cassio has it.

  1. The History & Development of Reflexology

    body to regain homeostasis.12 In 1961, physiotherapists protested against the use of the word "therapy" in "zone therapy" so the name "reflexology" was adopted, to avoid confusion. Other names which have been used for the practice of foot reflexology include 'pressure point massage', 'compression massage', 'point pressure massage', and 'Vita-Flex'.

  2. ITGS portfolio Loss of employment and privacy issues regarding the rise of online grocery ...

    Indeed, items for sale include a whole lamb carcass for �120. Ambrian analyst Philip Dorgan said this suggested the retailer was targeting cash-and-carry and wholesale customers. The website also offers an eclectic mix of niche and ethnic foods, and halal and kosher meat.

  1. ITGS Extended Essay

    After all the research on primary data and the secondary data, I went analyzed the primary and secondary data and I came to a conclusion on the same. I then wrote a final conclusion, which would answer my research question.

  2. To what Extent Does Government Know What is Best for its Subjects? (Stimulus: Antigone)

    In many ways, Hobbes' and Creon's approaches are utilitarian. They seem to acknowledge that security and liberty are in contradiction. To Hobbes, the 'greatest good' is achieved by undermining liberty and maximizing security (via the maximization of paternalistic control). Therefore, according to Hobbes, collective security should not be held at

  1. An examination of applicability of IT based education within present secondary school curriculum

    Ordinateurs portables, projecteur, electronic white board , sont autant d'outils sur lesquels mise le SSS Droopnath Ramphul de Pamplemousses. Ce coll�ge veut dynamiser l'enseignement � travers de nouvelles m�thodes impliquant notamment des sessions interactives avec le Rajasthan et Chennai en Inde.

  2. Can the work of architect Le Corbusier be explored in the context of the ...

    These pilotis act as the supports for the house, leading to the free facade walls.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work