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Question 18M.3.SL.TZ1.12a

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ1.12a
Level SL Paper 3 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
18M.3.SL.TZ1.12a

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:

(a)

Outline what is meant by the edge effect.

[2]

Markscheme

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

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