Question 19M.2.SL.TZ1.13
| Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.2.SL.TZ1.13 |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | 13 | Adapted from | N/A |
Outline three ways in which a named environmental disturbance can impact an ecosystem.
[3]
a. numbers of species ✔
b. types of species ✔
c. impacts on food chains/webs ✔
d. food production/availability ✔
e. habitat/ecosystem alteration ✔
f. biochemical processes «photosynthesis/respiration/decomposition» ✔
g. biogeochemical processes «erosion/nutrient cycles» ✔
h. first example of abiotic environmental factor ✔
i. second example of abiotic environmental factor ✔
Award [2 max] if the environmental disturbance is not named.
The environmental disturbance may be a factor such as fire, farming, construction, extreme weather, introduction of an alien species/other human intervention.
Explanations are not required.
Many candidates listed three environmental disturbances and could gain only one mark if there was a correctly assigned impact. Deforestation, flooding and forest fires were most often cited, with impacts including species number, habitats, biodiversity, food chains and an abiotic factor.
