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Question 21M.1.SL.TZ1.25

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1.SL.TZ1.25
Level SL Paper 1 Time zone TZ1
Command term Question number 25 Adapted from N/A
25.
[Maximum mark: 1]
21M.1.SL.TZ1.25

On the islands of the St Kilda chain, off the coast of Scotland, there are small birds called St Kilda wrens (Troglodytes troglodytes hirtensis). They look similar to wrens on the mainland of Scotland (Troglodytes troglodytes indigenus), but they are larger and there are differences in the colour of their feathers.

What is the most likely explanation for these differences?

A. Convergent evolution

B. Stabilizing natural selection

C. Gradual divergence

D. Exposure to similar selection pressure

[1]

Markscheme

C

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