DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.b

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

Syllabus sections