O-LevelBiologyCoordination & Response5090/11 · May/June 2013 · Q241 Mark

The diagram shows a section through the lower arm of a human. [Figure showing a cross-section of a lower arm with muscles, skin, fat, bone X and bone Y labelled.] What are bones X and Y?

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AX: humerus, Y: radius

BX: humerus, Y: ulna

CX: radius, Y: humerus

DX: radius, Y: ulna

✓ Correct answer

D: X: radius, Y: ulna

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2013 Paper 1 Variant 1, question 24.

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