DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.16b
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.HL.TZ1.16b |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Discuss | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 3]
18M.3.HL.TZ1.16b
The graph shows the total number of alien species in marine ecosystems estimated by the European Environment Agency.
(b)
Discuss the global impacts of invasive alien species.
[3]
Markscheme
a. inter-specific competition/alien species may out-compete native species
b. lack of predators may allow alien species to thrive / reproduce more rapidly
c. alien species may utilize areas/ resources that native species cannot
d. predation by invasive species can cause loss of biodiversity
e. can lead to species extinction
f. alien species may introduce new diseases
g. global shipping/air travel allows rapid transfer of alien species to new ecosystems
