Turn the test tubes upside down in a beaker with colored water. Be sure the water level in each test tube is identical at the start of the experiment. Ideally no water should enter the test tubes until the seeds have time to respire. Measure and record the initial height of the water in each of the test tubes.
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Procedure for the lab activity on seed respiration:
1. Gather materials: Get seeds, petri dishes, cotton balls or filter paper, water, a glass jar, rubber stopper, and bent glass tube.
2. Prepare seeds: Place moist cotton balls or filter paper in petri dishes and spread seeds on top.
3. Set up respirometer: Fill the glass jar with water, insert the stopper with the bent tube.
4. Start experiment: Carefully place the petri dish on the stopper to create a seal.
5. Monitor gas exchange: Observe water level changes in the tube over time.
6. Analyze results: Measure water level change to determine respiration rate.
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Turn the test tubes upside down in a beaker with colored water. Be sure the water level in each test tube is identical at the start of the experiment. Ideally no water should enter the test tubes until the seeds have time to respire. Measure and record the initial height of the water in each of the test tubes.