The table shows the concentration of potassium ions and phosphate ions inside a plant root hair cell and in the water in the soil.
| Place | Ion concentration in mg per dm3\text{mg per dm}^3mg per dm3 (Potassium) | Ion concentration in mg per dm3\text{mg per dm}^3mg per dm3 (Phosphate) |
|---|---|---|
| In the root hair cell | 2470 | 1344 |
| In the water in the soil | 38 | 16 |
The ratio for the concentration of potassium ions in the root hair cell compared to the water in the soil is 65:165:165:1. Calculate the ratio for the concentration of phosphate ions in the root hair cell compared to the water in the soil.
Waterlogged soil has its air spaces completely filled with water. Suggest why this prevents root hair cells from absorbing potassium or phosphate ions.
Complete the table below by naming a biological molecule that is made in plants using each of the mineral ions.
| Mineral ion | Molecule made using the mineral ion |
|---|---|
| magnesium | |
| nitrate |
23 exam-style questions on Edexcel IGCSE Biology Movement of substances into and out of cells. Each one has a worked solution and a mark scheme showing where the marks go.