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To find out whether maggots respond in proportion to light intensity.

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Introduction

Stacey Beard 23 January 2001 10BL Response to Stimuli Aim: to find out whether maggots respond in proportion to light intensity. Prediction I predict that a maggots photoreceptors respond to different intensities of light, and that when the light is more intense the receptors send an electrical message down the maggots nervous system, which makes the maggot move faster than it would if the light was less intense. In a previous experiment the further away the light source was the slower the maggot took to move away five centimetre. ...read more.

Middle

This will produce different light intensities. My constant will be the distance the maggot has to travel and the distance the clamp stand which holds the light is away from the maggot. To make sure my results are accurate and to try and lower the chance of an anomaly occurring I will do each different light intensity p3 times using three different maggots. I will use three different maggots because each maggot may have a different fitness level or one may be faster then another, and using three different maggots will stop this. ...read more.

Conclusion

Maggots are very unhygienic and so I shall wear throw away gloves when handling them to stop the risk of infection, I will also do my experiment on a wooden tray so that germs are not left on the workbench, and after I have finished my experiment I will wash my hands. Flowchart of experiment Light Intensity 1/d� Time taken (s) Exp. 1 Time Taken (s) Exp. 2 Time taken (s) Exp. 3 Average 1/5� = 0.04 13.86 44.00 45.13 34.33 1/10� = 0.01 15.13 45.84 - 30.49 1/15� = 0.004 14.29 27.19 37.35 26.27 1/20� = 0.0025 11.53 30.00 31.33 23.29 1/25� = 0.0016 18.06 23.05 30.21 23.77 ...read more.

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