| Date | November 2015 | Marks available | 1 | Reference code | 15N.3.SL.TZ0.21 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | State | Question number | 21 | Adapted from | N/A |
Question
State the process where pesticides such as DDT become more concentrated at each trophic level.
[1]
a.
Explain what is meant by the niche concept.
[3]
b.
Markscheme
biomagnification/bioaccumulation
a.
a. every organism in an ecosystem has their own role;
b. (includes) spatial habitat/space inhabited by organism;
c. (includes) feeding activities of organism;
d. (includes) interactions with other species;
e. valid description of an organism’s niche including habitat, feeding activities and interaction with other species;
b.
Examiners report
[N/A]
a.
Nearly all candidates gave good answers explaining the concept of a niche though some confused it with habitat.
b.
Syllabus sections
Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.3 Impacts of humans on ecosystems
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