O-LevelBiologyCoordination & Response5090/11 · May/June 2010 · Q231 Mark

The diagram shows a reflex arc in which a bee sting causes the arm to be moved quickly. If the relay neurone at Q is damaged, how will the transmission of nerve impulses in the reflex arc be affected? [Figure 23.1]

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AThey cannot pass from P to Q.

BThey cannot pass from P to R.

CThey cannot pass from Q to P.

DThey cannot pass from R to Q.

✓ Correct answer

B: They cannot pass from P to R.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 23.

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