O-LevelBiologyPlant Nutrition5090/11 · Oct/Nov 2025 · Q91 Mark

An investigation is carried out on the rate of photosynthesis in different environmental conditions. The graph shows the results. [Figure 9.1] Which conditions could have produced the results for curve R?

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A0.004% carbon dioxide in air, 20°C environmental temperature

B0.04% carbon dioxide in air, 30°C environmental temperature

C0.4% carbon dioxide in air, 20°C environmental temperature

D4.0% carbon dioxide in air, 30°C environmental temperature

✓ Correct answer

B: 0.04% carbon dioxide in air, 30°C environmental temperature

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Topic: Plant Nutrition, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2025 Paper 1 Variant 1, question 9.

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