Question 19N.3.SL.TZ0.15
| Date | November 2019 | Marks available | [Maximum mark: 4] | Reference code | 19N.3.SL.TZ0.15 |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline, State | Question number | 15 | Adapted from | N/A |
State the impact of environmental disturbance on biodiversity.
[1]
changes/increases/decreases richness/biodiversity/evenness/the numbers of species ✔
State an example of an alien species.
[1]
name of species and where it is invasive e.g. introduction of cane toads in Australia ✔
Accept common name of species but not general groups e.g. toads.
Outline the impact of alien species on endemic species in ecosystems.
[2]
a. ‹interspecific› competition with endemic/native species ✔ May be outlined using a specific example
b. may cause the extinction/reduction of endemic/native species
OR
reduces biodiversity
OR
becomes invasive ✔
c. does not have endemic / natural predators so may increase in numbers ✔
d. upsets the balance between predators and prey
OR
disrupts food chains ✔
