Rate of respiration- Core practical
- Created by: Emling
- Created on: 20-04-19 19:27
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- Rate of Respiration- Core Practical
- Variables
- Independent
- Volume of oxygen used
- Dependent
- Distance coloured fluid moves
- Control
- Amount of time measured for
- To allow the results to be compared
- Mass of beans
- Different masses can use varying amounts of oxygen
- Temperature
- Higher the temperature higher the rate of respiration
- Volume of air
- Different volumes contain different amounts of oxygen
- Soda lime concentration
- Soda lime will remove CO2 'created' in respiration
- Species of bean
- Different species have a different respiring rate
- Amount of time measured for
- Independent
- Equipment
- Respirometer
- 5g of broad beans
- Soda lime
- Coloured liquid
- Fine permanent marker
- Stopwatch
- Method
- 1.Weigh out 5g of beans and place into a boiling tube
- 2. Introduce a drop of red fluid into the pipet and open the three way tap to move the fluid to a convenient place
- 3. Mark the staring position of the fluid and isolate the respirometer
- 4. Start the stopwatch and measure the position of the fluid on the pipet every 30 seconds
- 5. Calculate the volume of oxygen used
- 6. Repeat the experiment 3 times
- Variables
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