O-LevelBiologyPlant Nutrition5090/11 · May/June 2022 · Q81 Mark

A gardener grows tomato plants in pots. To begin with, the plants produce green leaves and grow quickly. Then, after a few weeks, the leaves turn yellow. Which type of water can the gardener use on the plants to make the leaves turn green again? [Figure 8.1]

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AWater with fertiliser containing magnesium

BDistilled water

CRainwater

DWater with fertiliser containing nitrate

✓ Correct answer

A: Water with fertiliser containing magnesium

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

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