DP Biology (last assessment 2024)
Question 18M.3.SL.TZ2.b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ2.b |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Explain | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.SL.TZ2.b
One challenge associated with establishing nature reserves is concerns about edge effects. The graph shows that some edge effects in the Amazon rainforest are detected quite far in from the edge.
With respect to the example of disturbance-adapted beetles, explain what is meant by an indicator species.
[2]
Markscheme
a. species whose numbers/abundance are affected by a particular environmental condition
OR
species used to assess a specific environmental condition
b. «the presence of disturbance adapted beetles» indicates that the environment has been disturbed
c. «the presence of disturbance adapted beetles» indicates that there is an edge «within 200 m»
Examiners report
