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Factors affecting the rate of photosynthesis

Factors affecting the rate of photosynthesis. Using Computer simulations. Investigating Photosynthesis.

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Factors affecting the rate of photosynthesis

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  1. Factors affecting the rate of photosynthesis Using Computer simulations

  2. Investigating Photosynthesis • The aim of this simulation is to carry out virtual experiments to study the effect of different environmental factors on the rate of photosynthesis. The program uses Elodea experiments, measuring the rate of photosynthesis by the number of bubbles of oxygen which are produced.

  3. The Cambridge simulation pack. • Click on the following programs Weed2_2.exe Weed3_6.exe • And the following worksheet. WS1.DOC

  4. To investigate the effect of light intensity. • Use the slider bar to adjust the ‘Light Intensity’ • You need to cover a range of light different intensities. Set CO2 at 10 arbitary units (why?). Use white light. • Use Excel to tabulate your data. • At each intensity, you should carry out replicates to avoid anomalous results. • Use Excel to plot your summary data.

  5. To investigate the effect of carbon dioxide concentration. • Use the slider bar to adjust the ‘Carbon Dioxide Concentration’ • You need to cover a range of different concentrations. Use white light at 10 units. • Use Excel to tabulate your data. • At each concentration, you should carry out replicates to avoid anomalous results. • Use Excel to plot your summary data.

  6. To investigate the effect of the wavelength of light. • Set both the light intensity and carbon dioxide concentration at 10 arbitrary units. Change the colour of the filter and measure the rate of photosynthesis. • Use Excel to tabulate your data. • Use Excel to produce a graph of your findings.

  7. The Photosynthometer • Follow the following link to se how a traditional photosynthometer works • http://www.biology4all.com/resources_library/source/61c.swf • We will be using this piece of apparatus in our next practical session. • This apparatus is sometimes referred to as the ‘Audus Microburette’

  8. For discussion • Comment on the results, tables and plots which you have produced, explaining the effects which are evident. • Explain why bubble counts are not the best way to measure the quantity of oxygen produced by the plant. • Which other common environmental factor affects the rate of photosynthesis? Explain why it should have an effect.

  9. Summary – use Exam.net • Exam net password:SRE00465221 • http://www.exam.net • Use this material to write a summary of how these different factors affect the rate of photosynthesis in a plant

  10. Homework • Exam net password:SRE00465221 • Log onto exam.net; look for chap. 9 on homepage. • Open 9.5 – ‘Measuring Photosynthesis’ • Go to top of page and click on ‘exam questions’ tab • Read OCR June 2002. • Email answer to me (sham@kegs.org.uk) (Kelly_KEGS@yahoo.co.uk)

  11. Want to know more? Datalogging • One method used to determine the rate of photosynthesis involves data logging apparatus; click on the following link to see how this is done • http://www.fourier-sys.com/teachers_experiment.html# • Fourier Systems (1989) Inc. • Fourier Systems (1989) Inc.

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