O-LevelBiologyPlant Nutrition5090/11 · May/June 2022 · Q41 Mark
The rate of nitrate ion absorption by a root hair cell was measured at different soil nitrate concentrations. At X, the concentration of nitrate in the soil is the same as in the cell. Which graph shows how the rate of absorption varies with nitrate concentration in the soil? [Figure 4.1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Agraph showing the rate of nitrate absorption increasing linearly with nitrate concentration in the soil and then levelling off, with the linear phase extending past point X.
Bgraph showing the rate of nitrate absorption being zero until point X, then increasing linearly with nitrate concentration in the soil.
Cgraph showing the rate of nitrate absorption increasing linearly with nitrate concentration in the soil, with the linear phase reaching point X and then levelling off.
Dgraph showing the rate of nitrate absorption increasing linearly and indefinitely with nitrate concentration in the soil.
✓ Correct answer
A: graph showing the rate of nitrate absorption increasing linearly with nitrate concentration in the soil and then levelling off, with the linear phase extending past point X.
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