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Biology Coursework:Investigation of Speed of Woodlice in Areas of Different Light Intensities

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Biology Coursework: Investigation of Speed of Woodlice in Areas of Different Light Intensities Plan Hypothesis In my experiment the independent variable is light intensity and it will be measured by 1/distance of a lamp. There are many other variables, which must be kept constant or this will not be a fair test. They are: species of woodlouse, there are two main species but I am to use the same species, the Porcellio Scabar, throughout so it does not matter, they are very similar anyway. The other conditions which I will monitor are temperature, which, as the lamp gives off both heat and light I will put a transparent screen in the way to absorb any heat but allow light through, and humidity which will be controlled by keeping any water well away from any of the apparatus. ...read more.


Equipment list * Bottom half of a choice chamber * Circular white paper to fit in * Smaller transparent plastic circular container to go in the middle * This is stuck down with some Plastocene * One woodlouse * Lamp * Metre ruler for measuring distances * Retort stand for obtaining these Plan 1. Put woodlouse on track it will start running around as I found out in my trial investigation. 2. Start the timer when it crosses the starting line and stop it when it crosses it for a second time 3. Repeat this with a lamp at different distances from very bright until it is in a position where the lamp does not make a difference to amount of light around the woodlouse. ...read more.


Other preliminary work which involved learning different woodlouse speeds at the extremes of bright light and darkness helped me choose what distances the lamp should be. Observations Light Intensity 1/distance(cm) Time Taken to Complete Course seconds Repeats seconds 1/20 32 48 1/40 50 35 1/60 67 61 1/80 59 45 1/100 65 52 1/120 49 67 1/150 79 88 1/300 76 81 This is not an explosive or dangerous experiment, therefore no safety precautions were taken except that for myself and the woodlouse I was very careful in the manner which I undertook this investigation. Analysing the Data Concerning averages I feel that it would not be necessary to take as not enough repeats were taken to justify them. ?? ?? ?? ?? James Crosbie 02/05/2007 ...read more.

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Here's what a teacher thought of this essay

3 star(s)

3 Stars. Response to the question
The student has answered the majority of the question. The scientific explanation and layout is of a variable quality with some elements such as the evaluation missing altogether.

Level of analysis
The hypothesis is not stated explicitly and it analysis has not been completed. Some of the control variables have been mentioned, and there is also a logical progression through the investigation as you can see how one section leads on to the next.

Quality of writing
The student has followed most of the conventions expected at this level.
All sections of the scientific method need to be addressed including the evaluation and analysis. There quality of the data is also variable to improve this more data needs to be collected and averages calculated.

Marked by teacher Cornelia Bruce 01/12/2012

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