A crop plant is grown in two soil conditions. In aerated soil, air spaces allow oxygen to reach the roots. In waterlogged soil, water fills the air spaces and oxygen does not reach the roots.
Samples of root cells use the amounts of glucose shown.
| sample | soil condition | amount of glucose used / µmol | ATP yield / µmol ATP per µmol glucose |
|---|---|---|---|
| A | aerated | 0.80 | 30 |
| B | waterlogged | 9.0 | 2 |
Calculate how much more ATP is produced by sample A than by sample B.
Explain why sample A produces more ATP even though it uses less glucose.
98 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.