O-LevelBiologyCoordination & Response5090/12 · May/June 2021 · Q231 Mark

The diagram shows three positions, X, Y and Z, where nerve impulses are blocked by a drug. [Figure 23.1] Which person listed below moves their leg in response to a pinprick, but does not feel it?

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Aperson with a block at X

Bperson with a block at Y

Cperson with a block at Z

Dperson with no block

✓ Correct answer

C: person with a block at Z

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2021 Paper 1 Variant 2, question 23.

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