DP Biology (first assessment 2025)

Test builder »

Question 19N.2.SL.TZ0.b.ii

Select a Test
Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.SL.TZ0.b.ii
Level SL Paper 2 Time zone TZ0
Command term Outline Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
19N.2.SL.TZ0.b.ii

Outline the impact of alien species on endemic species in ecosystems.

[2]

Markscheme

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 ✔

Syllabus sections