O-LevelBiologyEcology & Environment5090/11 · May/June 2024 · Q381 Mark

The graph shows the atmospheric carbon dioxide concentration from 1968 to 2000 in a country. [Figure 38.1] Every year there are variations in carbon dioxide concentration. What is the best explanation for these variations?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

Aincreased rate of photosynthesis in the summer months of each year

Bincreased rate of respiration in the winter months of each year

Chigher rainfall in the summer months of each year

Dincreasing yearly temperatures due to global warming

✓ Correct answer

A: increased rate of photosynthesis in the summer months of each year

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2024 Paper 1 Variant 1, question 38.

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