DP Biology (first assessment 2025)

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Question 21M.2.SL.TZ1.5a.i

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.SL.TZ1.5a.i
Level SL Paper 2 Time zone TZ1
Command term Outline Question number a.i Adapted from N/A
a.i.
[Maximum mark: 2]
21M.2.SL.TZ1.5a.i
(a.i)

Based on their structure, the insect and bat wings are analogous. Outline what is meant by an analogous trait.

[2]

Markscheme

a. analogous traits have a different evolutionary history/ancestry ✔

b. different structures are adaptations for flight ✔

c. selective pressure leads to a similar solution to the problem of flying ✔

Examiners report

Candidates found it hard to express themselves without contradiction.

In both parts the key to successful answers was in using the organisms given in the example. Contradictions were thus avoided.

Syllabus sections