Featured in PASCO’s Advanced Biology through Inquiry Teacher Guide
This manual features 22 challenging, standards-based, inquiry lab activities for AP, IB, and honors programs.
Students use a carbon dioxide gas sensor to investigate the rate of cellular respiration of germinating seeds.
Students investigate the rate of cellular respiration of germinating seeds using a carbon dioxide gas sensor to measure one of the products of this process.
C6H12 O6 + 6O2 --> 6H2O + 6CO2 + Energy (36 ATP)
Students design and conduct an experiment to investigate a factor that can affect the cellular respiration of germinating seeds or to measure respiration in other organisms, such as crickets. Investigations that vary the species, germination time, pH, temperature, and salinity work well.
Although the sensor reports oxygen concentration to a high resolution, its accuracy is ±1%, or 10,000 ppm. If students are measuring very small changes in oxygen concentration over a short period of time, they may see no change, or even a trend in the wrong direction. Often the change is insignificant despite the appearance of a trend on the data collection system. Students can try switching to a carbon dioxide gas sensor, measuring for a longer period of time, or increasing the size or number of organisms they are sampling to create a more observable change.
ME-6936 Metabolism Chamber
This experiment may require software and an interface for data collection.