DP Biology (first assessment 2025)

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Question 23M.1A.SL.TZ2.i

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.1A.SL.TZ2.i
Level SL Paper 1A Time zone TZ2
Command term Identify Question number i Adapted from N/A
i.
[Maximum mark: 1]
23M.1A.SL.TZ2.i

Breeding plumage can be an important signal for mate selection in birds. Breeding plumage in red knots (Calidris canutus) includes a rusty red colour. Red knots have six recognized subspecies, each with different migratory routes.

The scatter graph shows the overall migration distance and the breeding plumage colouration for different subspecies of red knots. The darkest plumage colouration is 6.

[Source: Used with permission of The Royal Society (U.K.), from Phil. Trans. R. Soc. B, Buehler, D.M. and Piersma, T, 363, 2008;
permission conveyed through Copyright Clearance Center, Inc.]

Identify the relationship between migration distance and plumage colouration.

[1]

Markscheme
  1. the longer the migration, the lighter the colour / vice versa;
  2. too much variation so it is not possible to see a relationship;

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