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

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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.

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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

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