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Biology

PRACTICAL: Demonstrating the production of CO2 in respiration

QuestionAnswer
What colour does hydrogen-carbonate indicator turn in the presence of carbon dioxide? Yellow
What colour is hydrogen-carbonate indicator normally? Orange
What should we do before the experiment to make the seeds start germinating? Soak them in water for a day or two
When investigating respiration, what do we do to the control beans before the experiment? Boil them to kill them, so they cannot respire
What 6 pieces of apparatus are needed for this experiment? 1. Boiling tubes 2. Rubber bungs 3. Hydrogen carbonate indicator solution 4. Gauze platform 5. Germinating seeds 6. Boiled/dead seeds
What colour change will occur in the tube containing germinating seeds? Orange ---> Yellow
What colour change will occur in the tube containing dead seeds? Orange ----> Orange
What 3 factors must be kept the same in this experiment? 1. Volume of hydrogen carbonate indicator 2. Number of seeds 3. Temperature of the environment
What are we changing in this experiment? The content of the boiling tube (germinating/dead seeds)
What 3 things about the beans must be kept the same? 1. Age 2. Size 3. Species
How long should we leave the experiment before checking the results? A few hours
Created by: JoeMather
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