Two compartments, P and Q, are separated by a partially permeable membrane. The table shows the initial concentrations of two substances in each compartment.
| Substance | Concentration in P in g/dm³ | Concentration in Q in g/dm³ |
|---|---|---|
| Urea | 6.0 | 2.0 |
| Starch | 4.0 | 0.0 |
Which statement correctly predicts the net movement of the substances?
Both urea and starch have net movement from P to Q.
Urea has net movement from P to Q, while starch does not cross the membrane.
Urea has net movement from Q to P, while starch does not cross the membrane.
Starch has net movement from P to Q, while urea has no net movement.
140 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.