DP Biology (last assessment 2024)

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Question 22M.2.HL.TZ1.c

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

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 how the muscle attachment of insects differs from humans.

[1]

Markscheme

insect muscle is attached inside (the skeleton) and human muscle outside (the skeleton);
insect muscle is attached to exoskeleton and human to endoskeleton/bones;

Examiners report

This question probed whether candidates understood the difference between the skeletons of mammals and insects and thus where muscles are attached. Although the diagram shows tendon-like attachment of insect muscles, many candidates claimed that the lack of tendons was the prime difference.

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