Use of cell phones in class

Cell phones come with increasing capacities for doing useful information gathering in science classes. For the present unit, I taught students the skills of planning an investigation in which they measure the change of some populations across some sort of gradient. I gave them a recipe lab to meaure how the density and species of plants changes as one gets further from the trunk of a tree. The students then individually found a gradient on campus that they chose to investigate and developed a lab to sample this.

I thought this would be an ideal opportunity to investigate the variety of ways cell phones could be used in the lab. The plots the students were studying varied from the berm by the parking lot in front of the school, to the weeded area by the Suriwan Gate, to the slopes and drainage ditches on the cross country path around the soccer and baseball fields. I would not be able to be in constant contact with all of the students, so I gave them my cell phone noumber and asked them to call me when they had questions or concerns. I also suggested they use the cell phone to take pictures of the individual species of plants they were sampling and the calculator to do their averaging. I suggested students could use the angle function on some phones to measure the slopes of their plots. Now that I look back on it, those with GPS functions should have included the locations of their plots and used the compass on their phones to lay out the transects of their investigations.

Within five minutes, while I was working with one student, another student 150 metres away had a question that required my going to her plots. I was able to help her move to another, more suitable location early in the class period, reducing frustration and lost class time.

Students also used LoggerPro interfacing during this lab to measure the temperature and light intensities at various locations in their plots. This was done to either ensure these variables were maintained as relatively constant throughout their plots, or showed the values of the independent variable they were studying. (A student might check how the shade of trees affects the plant life. By measuring the light intensities at different locations under a tree and away from a tree, students plot the change in plant species' populations against light intensities.)

To use the light and temperature probes outside, students needed to put batteries in their LoggerPros, open the software on the computer and run the program for the appropriate probes, and use and care for the computers outside. It was a joy to watch students using a computer like they normally would use a clipboard and notebook to gather data and make observations.