DP Biology (first assessment 2025)

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Question 20N.2.SL.TZ0.c

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.SL.TZ0.c
Level SL Paper 2 Time zone TZ0
Command term Suggest Question number c Adapted from N/A
c.
[Maximum mark: 1]
20N.2.SL.TZ0.c

Sea urchins are destroying the giant kelp alga (Macrocystis pyrifera) marine forests of South East Australia. Suggest a reason that sea urchins might be an invasive species in this environment.

[1]

Markscheme

the sea urchins’ limiting factors in their original habitat are missing
OR
lack of (natural) predators for sea urchins

Examiners report

Many suggested that sea urchins' predators were not present, but too many irrelevant or blank answers were seen.

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