O-LevelBiologyPlant Nutrition5090/11 · Oct/Nov 2025 · Q71 Mark

Which changes occur in the air spaces of a green leaf on a sunny day?

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Acarbon dioxide concentration decreases, oxygen concentration decreases

Bcarbon dioxide concentration decreases, oxygen concentration increases

Ccarbon dioxide concentration increases, oxygen concentration decreases

Dcarbon dioxide concentration increases, oxygen concentration increases

✓ Correct answer

B: carbon dioxide concentration decreases, oxygen concentration increases

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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 7.

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