O-LevelBiologyTransport in Plants5090/11 · May/June 2016 · Q121 Mark

The graph shows the effect of oxygen concentration on the uptake of nitrate ions from the soil into a root hair cell. [Figure 12.1] What can be concluded from this information?

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ANitrate ions enter the root hair cell by active transport.

BNitrate ions enter the root hair cell by osmosis.

CNitrate ions leave the root hair cell by diffusion.

DNitrate ions leave the root hair cell in low oxygen concentrations.

✓ Correct answer

A: Nitrate ions enter the root hair cell by active transport.

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Topic: Transport in Plants, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 12.

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