Root hair cells take in nitrate ions and potassium ions from the soil.
The Table shows the concentration of these ions in the soil water and in the cytoplasm of a root hair cell.
Table
| Ion | Concentration in soil water in arbitrary units | Concentration in root hair cell in arbitrary units |
|---|---|---|
| nitrate | 2 | 50 |
| potassium | 1 | 40 |
Calculate how many times greater the concentration of nitrate ions is in the root hair cell than in the soil water.
Name the process the root hair cell uses to take in nitrate ions.
Use the Table to explain why nitrate ions cannot enter the root hair cell by diffusion.
After heavy rain, the soil becomes waterlogged. The air spaces in the soil fill with water.
Explain why the uptake of nitrate ions by the root hair cells decreases.
194 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.