• 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)

    Hypothesis The effect of light intensity on the rate of photosynthesis Photosynthesis depends on the amount of light available. Increase in light intensity increases the rate of photosynthesis and less of it decreases its rate. This is what is going to happen in my experiment.

  2. Marked by a teacher

    Investigate the relationship between wavelength of light and the rate of photosynthesis using pondweed.

    3 star(s)

    This means that when a plant is open to the elements of red and blue light, photosynthesis will be take place at a more rapid rate, producing a greater amount of oxygen, which can be noticed by the quantity of bubbles given off by the Canadian pondweed.

  1. Peer reviewed

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

    5 star(s)

    However, what is true is that the error increases, as the distances get shorter. Nonetheless, the error produced, even with the shorter distances is not significant enough to have any affect on the reliability of my results. After all, looking at my graph, it is evident that the error bars

  2. 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)

  1. How does light intensity affect the rate of photosynthesis

    so that I could check that the method worked and that the piece of Pondweed was photosynthesising. From this experiment I have decided that oxygen collection using this method is inaccurate, because the bubbles may be different sizes so I have changed this part of the method, and I will use a delivery tube to collect the oxygen.

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

    A graph of the rate of photosynthesis at different concentrations of carbon dioxide has the same shape as that for different light intensities. At low concentrations of carbon dioxide, the supply of carbon dioxide is the rate-limiting factor. At higher concentrations of carbon dioxide, other factors are rate limiting, such as light intensity or temperature.

  1. How temperature affects the rate of photosynthesis.

    have to acclimatise to a new environment while the experiment is being conducted. Thermometer 1 To measure the temperature of the water being used in the experiment and to make sure it is accurate. The thermometer being used will be accurate to 1 oC.

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

    The distance will be moved about 6 times to maximise the scale of the results, also light intensity can be measured using a light sensor, as opposed to lamp distance. Controlled Variable The controlled variables will be the amount of pondweed used, the amount of sodium hydrogen carbonate used in

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