lation to the light shining on them. This will be quite easy to instigate and the method will not have to be changed drastically. To measure the direction the maggots will move I will use a piece of paper with a chart (below) on, this will allow me to see which part of the chart the maggots go into and therefore show weather the maggots show positive, negative or no phototaxis behaviour.
• My null hypothesis has to be change because of the new criteria:
There is no relationship between the distance the maggot moves and the distance the maggot is away from the light. As there is the same angle for each of the three sectors an equal amount of maggots will leave the paper by each sector. 33.3% of the maggots should leave from each sector.
(Each of the positive and negative sectors should have angles of 120 and each of the neutral sectors should have angles of 60. The sector marked positive should be the closest to the light.)
• The maggots move a lot faster than I had anticipated so I will use 2-second intervals instead of 5 seconds.
• The only other problem I had was the effect of chemical traces made by the pencil to track the maggot's movement. This time I have decided to use a piece of OHP paper over a plastic box this way the light will still be able to get through the box and the maggots will not be affected by the chemicals from the pen at all.
To measured the rate of movement in cm/second this meant having to measure the distance moved and the time taken for each 2 second interval and using the following equation
The associated results are measurements taken to ensure that the variables of this investigation were being controlled. These variables needed to be controlled in order to improve result reliability.
Measurement 1st reading 2nd reading 3rd reading Average
Light intensity 2.950 flux 2.920 flux 2.930 flux 2.933 flux
Maggot mass 0.070g 0.080g 0.100g 0.083g
These ...