Cellular Respiration, Photosynthesis or Seed Germination Practice IA

PreLab Research Question Hypothesis Biological Significance Variables Table Materials Procedure

Dissolved Oxygen Measure change in oxygen in water C. resp or photosynthesis Add algae or Elodea to water 2 days

Carbon Dioxide sensor Photosynthesis or C. respiration Germinating peas Spinach leaves Little or no liquid Plastic bottles

Gas pressure Sensor Fermentation Yeast Test tubes Water baths On directions – don’t need the oil

Ethanol Sensor Fermentation Yeast Use flask Uses hot plate too Only four

Chromatography

Elodea and pH probe pH probe Carbon dioxide in water produces carbonic acid Cellular respiration or photosynthesis

DPIP Lab Spinach extract Experiment has to occur in a cuvette Uses colorimeter

Elodea bubble count Elodea Test tube Count bubbles released from the stem

Algae Beads and pH change Similar to DPIP Color change indicates use of CO2 or production of CO2 Uses spectrophotometer Experiment in Cuvette

As a group Create a list of variable that will impact photosynthesis and/or cellular respiration No two people in your group can have the same experiment

Seed Germination