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Question 18M.3.SL.TZ1.c

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.SL.TZ1.c
Level SL Paper 3 Time zone TZ1
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 1]
18M.3.SL.TZ1.c

Outline the characteristics of keystone species in an ecosystem.

[1]

Markscheme

a. keystone species has a strong/disproportionate effect on a community/food web/ecosystem 

b. absence of keystone species would completely alter the ecosystem

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