O-LevelBiologyEcology & Environment5090/11 · May/June 2020 · Q281 Mark

The flow of energy in ecosystems is non-cyclical. What is the main reason for this?

AEnergy can be transferred back to its original source.

BEnergy is not transferred from living things to their environment.

CEnergy is only transferred from smaller to larger organisms.

DEnergy is transferred from living organisms as heat.

✓ Correct answer

D: Energy is transferred from living organisms as heat.

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2020 Paper 1 Variant 1, question 28.

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