| Date | May 2017 | Marks available | 4 | Reference code | 17M.3.SL.TZ2.18 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 2 |
| Command term | Explain | Question number | 18 | Adapted from | N/A |
Question
Explain the use of indicator species to assess the condition of the environment.
Markscheme
a. indicator species are organisms that indicate health of ecosystem/level of pollution
b. they exist in higher relative numbers under certain environmental conditions
OR
if certain environmental conditions are not found, indicator species die/reproduce
c. are very sensitive/highly tolerant species
d. provides quantitative information on the quality of the environment around it
e. named example of indicator species and susceptibility
Must state a named species. eg: Lichens used to detect air quality.
f. indicator species are used to calculate biotic index
Examiners report
[N/A]
Syllabus sections
Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.4 Conservation of biodiversity
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