DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ1.b

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.HL.TZ1.b
Level HL Paper 2 Time zone TZ1
Command term Describe Question number b Adapted from N/A
b.
[Maximum mark: 2]
22M.2.HL.TZ1.b

The diagram shows a section through part of the leg of an insect and antagonistic muscles X and Y. The tibia moves in the direction shown by the arrow when the muscle is flexing.

[Source: D G Mackean www.biology-resources.com.]

Describe the role of muscle Y.

[2]

Markscheme
  1. flexor/flexion;
  2. bends/flexes the leg/limb/joint;
Examiners report

The mark scheme here was rather too demanding and very few candidates were awarded both marks. The biological distinctions between flexors and flexion were too fine and marks should have been awarded for other relevant ideas. A flexor is a muscle that causes flexion. Although we may speak colloquially of 'flexing our muscles' it is not a muscle that flexes but a limb at a joint.

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