Question 18N.3.HL.TZ0.c
| Date | November 2018 | Marks available | [Maximum mark: 3] | Reference code | 18N.3.HL.TZ0.c |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | c | Adapted from | N/A |
The graph shows a theoretical model that divides species into five ecological groups (I to V) related to the degree of tolerance to an increasing pollution gradient.
[Reprinted from Marine Pollution Bulletin, 40, A. Borja, J. Franco and V. Perez, 'A marine biotic index to establish the ecological quality of soft-bottom benthos within European estuarine and coastal environments', pp. 1100–1114, Copyright (2000), with permission from Elsevier. https://www.sciencedirect.com/journal/marine-pollution-bulletin]
Outline how organisms in Group V could be used to measure pollution in an environment.
[3]
a. group V organisms «could» contain indicator species ✔
b. group V organisms can survive in polluted environments «while others cannot» ✔
c. they have a high tolerance/BI index
OR
«relative number of» indicator species can be used to calculate the value of a biotic index ✔
d. the more group V present could indicate more pollution ✔
OWTTE
e. absence of group V could indicate a cleaner environment ✔
