• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Design a practical experiment to investigate the effect of light wavelength on the rate of photosynthesis.

Extracts from this document...

Introduction

Design a practical experiment to investigate the effect of light wavelength on the rate of photosynthesis. Aim: To investigate the effect of light wavelength/ colour of light on the rate of photosynthesis. Materials: Glass Jar, test tube, cork, pond weed, clamp, small lamp, sticky tape, red, blue, yellow and green filters, Stopwatch, small knife. Procedure: * Fill the glass jar nearly to the top with water. * Take one strand of pondweed and cut the end of the stem with a pair of scissors or razor. * Fill the test tube with water to the top of the cork. Slide the cut end of the pondweed stem through the hole in the cork so that they are held firmly in place. ...read more.

Middle

* Repeat this three times so that a fair average can be calculated. * Once the five minutes end, stop shining the lamp onto the pondweed and remove the coloured filter from around the jar. * Repeat the above processes, differing the colour of the filter wrapped around the jar each time, using either yellow, green, blue or red, using the same pond weed. Pictures!? Variables to be controlled in order to improve the validity of results obtained: * Distance that the light is shone- light intensity * Temperature- photosynthesis proceeds by a series of chemical reactions controlled by enzymes, which are sensitive to temperature. Around 30. Lower temp, rate slowed ??? * Use the same piece of pond weed- otherwise the size of the pond weed may differ/ surface area may differ * Stopwatch * Repeat three times Measurements The ...read more.

Conclusion

This can be plotted onto a graph (fig 1.1). This graph is called the Absorption Spectrum. The Absorption Spectrum is very similar in shape to the Action Spectrum (fig 1.2). The Action Spectrum is a graph showing rate of photosynthesis with different wavelengths of light. This is evidence that light energy absorbed by the pigments in chlorophyll a and chlorophyll b is used in photosynthesis. Criticise * The amount of carbon dioxide surrounding the plant may not have remained the same throughout the experiment. * The temperature did not remain the same. * The thickness of the filter * The wrapping round of the coloured filter * Reliability of using the human eye to observe the amount of bubbles produced. * For red- times cos bubbles evolved too quickly * Other sources of light being shone onto the pond weed from elsewhere * Not repeated ...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

Here's what a teacher thought of this essay

3 star(s)

This essay starts very well. It has a good method and some good results.

It could be improved by adding some further explanation and writing a full conclusion.

***

Marked by teacher Sam Morran 15/05/2013

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)

    high that I found it difficult to count the amount of bubbles. I estimate a margin of error of at least 3 bubbles for each reading taken. To improve the accuracy of the results, the readings would have to be taken several more times.

  2. Peer reviewed

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

    5 star(s)

    Immediately after turning the projector on, press play and record on the video player. Record their movements, using the camera, for 1 minute. Press stop, on the video player, after a minute. Repeat this procedure for the next 9 different distances.

  1. Experiment to investigate the effect of Carbon Dioxide on the Rate of Photosynthesis

    different sizes and have different conditions, also keeping the same elodea helps to monitor the amount of chlorophyll. Chlorophyll also affects the rate of photosynthesis. The elodea must react in the same way for each experiment so if different elodeas are used then they may react in a different way.

  2. Factor affecting the rate of fermentation.

    0.50 15 21.00 15 16.00 15 1.20 15 1.50 16 24.00 16 22.00 16 1.45 16 2.00 17 26.00 17 26.00 17 1.70 17 3.00 18 29.00 18 28.00 18 1.85 18 4.00 19 32.00 19 30.00 19 2.05 19 5.00 20 36.00 20 33.00 20 2.35 20 6.00 They all start at 10mL (be more accurate).

  1. Determine the water potential of potato tuber cell with the varying affect of solute ...

    From looking at the results you can see that I was correct in saying this because the concentration is now much higher then the dilution. This meant that water would leave the cylinder plus the mass loss will be more than that of the 0.6 mol dm-3 solution because now

  2. Investigating the effect of Light Intensity on Elodea.

    On the first graph there was one anomalous result: at the distance of 20cm. This is obvious because it did not fit into the curve of best fit. On the second graph there were several anomalous results: at the distances of 10cm, 30cm, and 35cm. The anomalous results were circled.

  1. Experiment to Investigate the Effect of Temperature on the Rate of Photosynthesis in Elodea.

    In the medium surrounding the strands were motile, aerobic bacteria. After a few minutes, the bacteria had congregated around the portions of the filament illuminated by red and blue light. Assuming that the bacteria were congregating in regions where oxygen was being evolved in photosynthesis, Engelmann concluded that red and blue light are the most effective colours for photosynthesis.

  2. What is the effect on the rate of respiration of yeast cells with glucose ...

    Below is a list of these: > The same amount of yeast should be used because if more or less than needed is used, the results would obviously be affected, and the experiment would be very unfair. > The volume of glucose has to be controlled, i.e.

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