Question 1
FA student investigated whether germinating pea seeds release energy as heat.
The Figure shows the apparatus.
Figure
The pea seeds in flask B had been boiled, cooled and then rinsed in disinfectant.
The Table shows the student's results.
Table
| Day | Temperature in flask A in ∘C^\circ\text{C}∘C | Temperature in flask B in ∘C^\circ\text{C}∘C |
|---|---|---|
| 0 | 20 | 20 |
| 1 | 22 | 20 |
| 2 | 25 | 20 |
| 3 | 27 | 20 |
a.[1]
Calculate the increase in temperature in flask A between day 0 and day 3.
b.[2]
Explain why the temperature in flask A increased.
c.[2]
Explain why the student set up flask B.
d.[1]
Suggest why the seeds in flask B were rinsed in disinfectant.
8.3 Respiration Questions
42 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.