A student measured the rate of uptake of two ions, P and Q, by plant roots at two different oxygen concentrations.
Table: The rate of uptake of ions P and Q by plant roots at a low and a high oxygen concentration
| Ion | Rate of uptake at low oxygen concentration in μmol per hour | Rate of uptake at high oxygen concentration in μmol per hour |
|---|---|---|
| P | 2 | 18 |
| Q | 9 | 10 |
Which conclusion do the data support?
Both P and Q are absorbed into the root cells by simple diffusion
P is absorbed by active transport and Q is absorbed by diffusion
Q is absorbed by active transport and P is absorbed by diffusion
Both P and Q are absorbed into the root cells by active transport
58 exam-style questions on AQA GCSE Biology 1.3 Transport in cells, covering 1.3.1 Diffusion, 1.3.2 Osmosis, and 1.3.3 Active transport. Each one has a worked solution and a mark scheme showing where the marks go.