DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ1.5a

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Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.HL.TZ1.5a
Level HL Paper 2 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 1]
22M.2.HL.TZ1.5a

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.]

(a)

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. 

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