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.
Cellular Respiration Sample Lab (232 KB – PDF)
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.
Sensors / Equipment Used:
The PASPORT Carbon Dioxide Gas Sensor measures carbon dioxide concentration CO2 (parts per million) in gases such as air. Ideal for studies of photosynthesis, respiration, fermentation and more.
The Oxygen Gas Sensor accurately measures O2 concentration in the atmosphere or in enclosed spaces. Study animal, plant or cellular respiration, air quality, O2 production from chemical reactions and more.
ME-6936 Metabolism Chamber
The Associated Bundle:
Contains an EcoChamber, a Metabolism Chamber and all the probeware needed to perform the activities in the Advanced Biology through Inquiry lab manual.