Question 18M.3.SL.TZ1.12
| Date | May 2018 | Marks available | [Maximum mark: 6] | Reference code | 18M.3.SL.TZ1.12 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Analyse, Outline, State | Question number | 12 | Adapted from | N/A |
Isopods are a group of organisms belonging to the arthropods and include woodlice (slaters) and other species, some of which live on land and others in water. A study was carried out on the diversity of isopod species living in a bog (site B), the edge zone separating the bog and forest (site E) and adjacent forest (site F).
Data collected for the three sites are summarized in the table:
Outline what is meant by the edge effect.
[2]
a. occurs at the boundary between two ecosystems/habitats
b. gradient of abiotic conditions at the edge
c. (as a result) community differs at the edge
d. community at the edge is more diverse than adjacent communities
Analyse the differences in biodiversity seen in the three sites.
[3]
a. number of individuals differs more than number of species between the zones
b. zone E has lowest diversity / zone F has highest diversity
c. zone B has higher diversity than zone E
d. edge effect is evident
State one method that could be used to estimate the isopod population size.
[1]
capture-mark-release-recapture
OR
quadrat / transect