O-LevelBiologyPlant Nutrition5090/12 · Oct/Nov 2022 · Q81 Mark

The graph shows how the yield of a wheat crop varies with the addition of different amounts of nitrate fertiliser. What can be concluded from the graph?

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ANitrates help the formation of chlorophyll in wheat leaves.

BThe yield of wheat is proportional to the amount of nitrate fertiliser added.

CNitrate is needed for the formation of proteins.

DNitrates are required for healthy plants, but excess nitrates may inhibit growth.

✓ Correct answer

D: Nitrates are required for healthy plants, but excess nitrates may inhibit growth.

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2022 Paper 1 Variant 2, question 8.

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