O-LevelBiologyCoordination & Response5090/11 · May/June 2011 · Q211 Mark

The diagram refers to the control of water concentration in the blood. Why is this a negative feedback system?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

AIt decreases the amount of water in the blood.

BIt increases any change in the amount of water in the blood.

CIt increases the amount of water in the blood.

DIt reverses any change in the amount of water in the blood.

✓ Correct answer

D: It reverses any change in the amount of water in the blood.

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Topic: Coordination & Response, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2011 Paper 1 Variant 1, question 21.

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