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Question 20N.3.SL.TZ0.12b

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.3.SL.TZ0.12b
Level SL Paper 3 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
20N.3.SL.TZ0.12b

Ecologists studied the distribution of five species of insectivorous wood warblers of the genus Dendorica living on different parts of coniferous trees in mature forests.

(b)

Outline the principle of competitive exclusion.

[2]

Markscheme

a. no two species can occupy the same niche;

b. competition between them would cause one species to drive the other out
OR
one of the two species would need to adapt and evolve accordingly;

Examiners report

When describing competitive exclusion many candidates simply described competition. Some mentioned habitat rather than niche.

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