O-LevelBiologyEcology & Environment5090/11 · May/June 2016 · Q301 Mark

The diagram shows part of the carbon cycle. [Figure 30.1] What are the processes X and Y?

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AX: photosynthesis, Y: decomposition

BX: photosynthesis, Y: excretion

CX: respiration, Y: photosynthesis

DX: respiration, Y: respiration

✓ Correct answer

D: X: respiration, Y: respiration

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2016 Paper 1 Variant 1, question 30.

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