• 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

Determine whether or not the intensity of light would affect the rate of photosynthesis in a plant.

Extracts from this document...

Introduction

��ࡱ�>�� df����c�������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������5@ ��0Vbjbj�2�2 (��X�XfK�������������������8 ���v��������DFFFFFF$;R��j������j���������D�D$��$�� �� r�����$D�0�$g �g $������g �$ �������jjGCSE Biology - Photosynthesis Coursework Aim The aim of my experiment was to determine whether or not the intensity of light would affect the rate of photosynthesis in a plant. To do this, I placed a piece of Canadian pondweed in varying light intensities, and observed the amount of oxygen being given off. I used Canadian pondweed because of its unusual quality of giving off bubbles of gas from a cut end, when placed in water. Introduction Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide and water causing the release of sugar and oxygen. The chemical equation for photosynthesis can be expressed as: (light) 6CO2 + 6H2O � C6H12O6 + 6O2 (in the presence of chlorophyll) The fact that all plants need light in order to photosynthesise has been proven many times in experiments, and so it is possible to say that without light, the plant would die. The reason that light intensity does affect the rate of photosynthesis is because as light, and therefore energy, falls on the chloroplasts in a leaf, it is trapped by the chlorophyll, which then makes the energy available for chemical reactions in the plant. Thus, as the amount of sunlight, or in this case light from a bulb, falls on the plant, more energy is absorbed, so more energy is available for the chemical reactions, and so more photosynthesis takes place in a given time. There are many factors, which affect the rate of photosynthesis, including light intensity, temperature and carbon dioxide concentration. The maximum rate of photosynthesis will be constrained by a limiting factor. This factor will prevent the rate of photosynthesis from rising above a certain level, even if the other conditions needed for photosynthesis are improved. ...read more.

Middle

Audus apparatus Using the described method, I found the following results: Results for main experiment Distance Light intensity length 1 length 2 average length (cm) (lux) (mm) (mm) (mm) 5 1015 3.5 3.5 3.5 10 945 3.5 3.5 3.5 12 770 4 3 3.5 14 639 3.5 3.5 3.5 16 500 3 3.5 3.25 18 395 3 3 3 20 310 2 3.5 2.75 25 208 1.5 2.5 1.75 30 149 1.5 1.5 1.5 35 110 1 1 1 40 80 0.5 1 0.75 45 55 0 0.5 0.25 Although, because I was using light intensity as my variable, I did not need to record the distances as well, I did, simply to use them as a marker for each result, so that I only had to record the light intensity once at the beginning and from then I just had to align the lamp at the correct distance each time. Analysis My graph was in the form of a best-fit curve. I drew it as a curve rather than a straight line because of the clear pattern of the points. This meant that the rate of photosynthesis increased as the light intensity increased. This was because photosynthesis is a reaction, which needs energy from light to work, so as the amount of energy available from light increased with the rise in light intensity, so did the amount of oxygen produced as a product of photosynthesis. My graphs showed that the relationship between the light intensity and the rate of photosynthesis was non-linear, as both graphs produced a best-fit curve. However, as I expected in my hypothesis, it does appear that for the very first part of the graph, the increase in rate is in fact proportional to the increase in light intensity (i.e. a straight line) and I can show this by taking some readings from the graph: Light intensity Rate of photosynthesis (All increase by the 100 1 (mm/min) ...read more.

Conclusion

To extend my enquiries into the rate of photosynthesis, I could perhaps try to link in some of the other limiting factors to the same experiment, as well as investigating them in their own right. It could also be interesting to explore the effects of coloured lights on the rate of photosynthesis, which could lead to the question of whether or not other types of light, such as fluorescent lights or halogen lights, would have a different effect on the rate of photosynthes This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ This document was downloaded from Coursework.Info - The UK's Coursework Database - http://www.coursework.info/ eSfS�S�SFTGT�T�T*U+U�U�UVVVV������������hn�hn�OJQJhn�hn�CJOJQJ%hn�hn�OJQJfHq� ����)hn�hn�CJOJQJfHq� ����hn�h>8� h>8�hn�)*./01� � � � � � � � � � D E F G � � � � � �����������������������������gd>8�fSV��� � � � fghiklmnz{���������������������������������������������gd>8�������������������� ^_`acde�����������������������������gd>8�ef���������������������������������������������������������gd>8������������������ �����������������������������gd>8� !$%*+/02367<=ABDEHINOSTVWYZ�����������������������������gd>8�Z`aefhijk����������xyz{}~���������������������������������gd>8����� ������������A!B!C!D!�"�"�����������������������������gd>8��"�"�"�%�%�%�%�%�%�%�%�%�%&&&&& &&&#&$&4&5&6&7&J&K&L&�����������������������������gd>8�L&M&S&T&U&V&\&]&^&_&j&k&l&m&y&z&{&|&�&�&�&�&�&�&�&�&�&�&�&�&�����������������������������gd>8��&�&�&�&�&�&�&�&�&�&�&�&�&S+T+U+V+X+Y+Z+[+]+^+_+`+p+q+s+t+u+�����������������������������gd>8�u+v+x+y+z+{+}+~++�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�����������������������������gd>8��+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+�+W,�����������������������������gd>8�W,X,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�,�����������������������������gd>8��,�,�,�,�,�,�,�,�,-- - ---------8-9->-?-D-E-G-H-K-�����������������������������gd>8�K-L-Q-R-U-V-Y-Z-_-`-b-c-f-g-l-m-r-s-x-y-~--�-�-�-�-�-�-�-�-�����������������������������gd>8��-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�����������������������������gd>8��-�-�-�-�-�-�-�-�-�-�-�-�-�-�-�-.... . ........ .�����������������������������gd>8� .#.$.'.(.+.,.../.2.3.7.8.=.>.A.B.H.I.K.L.O.P.T.U.X.Y.^._.e.�����������������������������gd>8�e.f.h.i.j.k.m.n.o.p.�/�/�/�/�/�/�/�/�/�/�/�/�/�/�/�/�/�/�1�1�����������������������������gd>8��1�1�1F3G3H3I3K3L3M3N3P3Q3R3S3�3�3�3�3�3�3�3�34 4!4"4�4�4�4�����������������������������gd>8��4�45555555 5�7�7�7�7�7888 ; ;;;;;;;;;;;�����������������������������gd>8�;$;%;';(;);*;�<�<�<�<�>�>�>�>�>�>c?d?e?f?h?i?j?k?�?�?�?�?�?�����������������������������gd>8��?�?�?�?C@D@E@F@�@�@�@�@�@�@�@�@�B�B�B�B�B�B�B�B�B�B�B�B,C-C�����������������������������gd>8�-C.C/C�C�C�C�C�C�C�C�CDDDDDD D D]D^D_D`D�D�D�D�D�D�D�D�����������������������������gd>8��D�D�E�E�E�E�G�G�G�GyKzK{K|KWMXMYMZMOOOO�Q�Q�Q�QeSfS�S����������������������������$a$gdn�gd>8��S�S�S�SGTHTITJT�T�T�T�T+U,U-U.U�U�U�U�UVVVVVV�������������������������gd>8�$a$gdn�$a$gdn�&1�h:p>8���/ ��=!�'"�'#��$��%��D@�D NormalCJ_H aJmH nHsH tHDA@�D Default Paragraph FontRi�R Table Normal�4� l4�a� (k�(No ListDZ@�D >8� Plain TextCJOJQJ^JaJ4@4 n�Header ���!4 @4 n�Footer ���!`�o"` n�watermark header$a$CJOJQJfHq� ����N�o2N n�watermark footer$a$ CJOJQJN�������Nr�V�:��V-� �e�Z��"L&�&u+�+W,�,K-�-�- .e.�1�4;�?-C�D�SV.0123456789:;<=>?@ABCDEFGHIV/�$eKN��alex�n�>8��@fK�C�NP@��Unknown������������G��z ��Times New Roman5V��Symbol3&� �z ��Arial7&� � �VerdanaG5�� �����h�MS Mincho-�3� fg?5� �z ��Courier New"1���h��f��f��f� �@��� �@���$�������4eMeM3�� H�?������������������>8���(GCSE Biology - Photosynthesis CourseworkTCoursework.Info Coursework - http://www.coursework.info/ - Redistribution ProhibitedTCoursework.Info Coursework - http://www.coursework.info/ - Redistribution Prohibitedalexalex�� ��Oh��+'��0����4D�� 8 D P \hpx��)GCSE Biology - Photosynthesis Coursework WoUCoursework.Info Coursework - http://www.coursework.info/ - Redistribution ProhibitedualexewoUCoursework.Info Coursework - http://www.coursework.info/ - Redistribution Prohibitedu>Downloaded from Coursework.Info - http://www.coursework.info/is Normal.dotfalexl.d2exMicrosoft Word 10.0@@.(X���@.(X���@.(X���� �@�� ��Õ.��+,��D��Õ.��+,���D���H����� ���� � %�UCoursework.Info Coursework - http://www.coursework.info/ - Redistribution Prohibitedy -UCoursework.Info Coursework - http://www.coursework.info/ - Redistribution Prohibitedy -UCoursework.Info Coursework - http://www.coursework.info/ - Redistribution Prohibitedy -TN��eMA )GCSE Biology - Photosynthesis Coursework Titled@���+K_PID_LINKBASE CopyrightDownloaded FromCan RedistributeOwner�A4http://www.coursework.comcoursework.comehttp://www.coursework.comCoNo, do not redistributecoursework.com/ !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJ����LMNOPQR����TUVWXYZ����\]^_`ab��������e������������������������������������������������������������������������������������������������������������Root Entry�������� �F�y7r���g�1Table��������KWordDocument��������(�SummaryInformation(����SDocumentSummaryInformation8������������[CompObj������������j������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������ ���� �FMicrosoft Word Document MSWordDocWord.Document.8�9�q ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Green Plants as Organisms 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 GCSE Green Plants as Organisms essays

  1. Marked by a teacher

    Investigation to find out how light intensity effects the rate of photosynthesis

    4 star(s)

    When the lamp is closest to the jar, the rate of photosynthesis or the number of bubbles produced will be the most. As the lamp will be moved away from the jar the number of bubbles produced will decrease so will the rate of photosynthesis.

  2. Peer reviewed

    An Investigation into the Effects that Different Light Intensities have on the Speed of ...

    5 star(s)

    In this way I was able to see the range of error and this range is shown in the graph below: Shortest Dist. (mm) % error Longest Dist. (mm) % error 30 3.33 918 0.12 It is clear that the error incurred is miniscule.

  1. Photosynthesis. The aim of my experiment was to determine whether or not the intensity ...

    10, 12, 14, 16, 18, 20, 25, 30, 35, 40 and 45, cm's. Method Input variables - light intensity is to be varied by increasing and decreasing the distance from the light source to the plant Output variables - volume of oxygen produced (rate of photosynthesis)

  2. How does light intensity affect the rate of photosynthesis

    These were the results that I gained from my preliminary experiment. I also decided that I should take more measurements, but still using the same scale (50mm gap), so that I could gain a wider variety of results for a more reliable outcome.

  1. Investigating the factors, which affect the rate of photosynthesis in a pond plant.

    This is due to the factors that are being investigated as the lamp and the temperature of the boiling water are the same. Each experiment that you have decided to carry out should be repeated more than once so you can make sure that your results are accurate and so

  2. How temperature affects the rate of photosynthesis.

    The amount of products released will decrease and so would the rate of photosynthesis. For instance, during carboxylation at a temperature of 65 oC, the enzyme Rubisco will be vibrating rapidly and will eventually lose its 3D shape and the active site would be ruptured so that substrate doesn't fit

  1. Investigating the effect of temperature on the rate of photosynthesis

    Others regenerate RuBP. This cycle is the Calvin cycle. http://www.bio.umass.edu/biology/conn.river/calvin.html Factors affecting the rate of photosynthesis: The main factors affecting the rate of photosynthesis are light intensity, temperature and carbon dioxide concentration. As light intensity increases, the photosynthetic rate increases until a point is reached where the rate begins to level off.

  2. An Investigation on the effects of Light Intensity on Photosynthesis

    there was no change in the results and that the light will begin to heat the water bath making it inaccurate. I also found that there was not much point in having the lamp any further away than 70cm because very little photosynthesis occurred.

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