5.6.8 Measuring rates of respiration
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What is the rate of aerobic respiration determined by?
• Measuring the rate at which carbon dioxide is produced or oxygen is used up.
What happens when the tap is open during the practical?
• The practical resets.
What is measured during the practical?
• The volume of carbon dioxide.
What is the purpose of the layer of oil?
• Prevents oxygen reaching the yeast.
What is the equipment called used to measure respiration?
• Manometer.
As the seeds aerobically respire, what gas do they take in and what gas do they produce?
• Take in oxygen • Produce carbon dioxide.
What substance absorbs the carbon dioxide?
• Soda lime.
When the soda lime absorbs the carbon dioxide, what does it cause the coloured liquid to do?
• Move closer to the seeds.
What is the rate determined by?
• The distance the liquid moves in a set time.
How do you work out the volume of the gas?
• Measure the radius of the tube.
How do you work out the rate per gram?
• Measure the mass of the seeds.
What is the control group of the manometer practical and why?
• Glass marbles due to no movement.