5.6.8 Measuring rates of respiration Flashcards
1
Q
What is the rate of aerobic respiration determined by?
A
- Measuring the rate at which carbon dioxide is produced or oxygen is used up.
2
Q
What happens when the tap is open during the practical?
A
- The practical resets.
3
Q
What is measured during the practical?
A
- The volume of carbon dioxide.
4
Q
What is the purpose of the layer of oil?
A
- Prevents oxygen reaching the yeast.
5
Q
What is the equipment called used to measure respiration?
A
- Manometer.
6
Q
As the seeds aerobically respire, what gas do they take in and what gas do they produce?
A
- Take in oxygen
- Produce carbon dioxide.
7
Q
What substance absorbs the carbon dioxide?
A
- Soda lime.
8
Q
When the soda lime absorbs the carbon dioxide, what does it cause the coloured liquid to do?
A
- Move closer to the seeds.
9
Q
What is the rate determined by?
A
- The distance the liquid moves in a set time.
10
Q
How do you work out the volume of the gas?
A
- Measure the radius of the tube.
11
Q
How do you work out the rate per gram?
A
- Measure the mass of the seeds.
12
Q
What is the control group of the manometer practical and why?
A
- Glass marbles due to no movement.
