DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ1.a

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.HL.TZ1.a
Level HL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
22M.2.HL.TZ1.a

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.]

Outline a reason for the muscles being described as antagonistic.

[1]

Markscheme

cause opposite movements / pull in opposite directions / when one contracts the other relaxes;

Examiners report

Most candidates were able to outline what antagonistic muscles are. The term 'extended' was sometimes used instead of 'relax' which is the preferred term as it indicates passivity. 

Syllabus sections