O-LevelBiologyPlant Nutrition5090/11 · May/June 2013 · Q31 Mark
An experiment measured the rate at which plants take up magnesium ions from solution. One plant was given a poison that stops respiration. Another plant was left as normal. The graph shows the results. [Figure showing a graph of rate of uptake of magnesium ions vs. concentration of magnesium ions in the solution, with two curves labelled 'N' (plant left as normal) and 'P' (plant given poison).] How are the magnesium ions being absorbed by the plants at points N and P?
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.
Apoint N: active transport, point P: active transport
Bpoint N: active transport, point P: diffusion
Cpoint N: diffusion, point P: active transport
Dpoint N: diffusion, point P: diffusion
✓ Correct answer
B: point N: active transport, point P: diffusion
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