O-LevelBiologyEcology & Environment5090/11 · May/June 2013 · Q291 Mark

A tree has insect larvae burrowing in its leaves. The emerging insects are eaten by birds and the birds have parasitic fleas living amongst their feathers. [Figure showing four different pyramid shapes labelled 1, 2, 3, 4.] Which is a pyramid of biomass and which is a pyramid of numbers for this food chain?

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Apyramid of mass: 1, pyramid of numbers: 3

Bpyramid of mass: 1, pyramid of numbers: 4

Cpyramid of mass: 2, pyramid of numbers: 3

Dpyramid of mass: 2, pyramid of numbers: 4

✓ Correct answer

C: pyramid of mass: 2, pyramid of numbers: 3

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Topic: Ecology & Environment, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 29.

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