O-LevelBiologyEcology & Environment5090/12 · Oct/Nov 2019 · Q281 Mark

Why is the flow of energy in an ecosystem said to be non-cyclic?

AEnergy can only be passed on in the form it entered the ecosystem.

BEnergy can only be passed on to a larger organism.

CEnergy cannot be completely returned to its original source.

DEnergy cannot have its form changed within an organism.

✓ Correct answer

C: Energy cannot be completely returned to its original source.

Oracle Prep sorts past-paper questions by topic, so you can drill Ecology & Environment and see which topics are most likely to come up next.

Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2019 Paper 1 Variant 2, question 28.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content