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Question 18M.3.HL.TZ1.15b

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.3.HL.TZ1.15b
Level HL Paper 3 Time zone TZ1
Command term Predict Question number b Adapted from N/A
b.
[Maximum mark: 3]
18M.3.HL.TZ1.15b
(b)

A retreating glacier leaves an environment of lifeless glacial deposits, including sands and gravels. Retreating glaciers often offer suitable sites for primary succession.

Predict the process of succession that takes place on exposed bare ground as the glacier retreats.

[3]

Markscheme

a. (bare ground) colonized by microorganisms/pioneer species

b. thin soil forms from rock fragments / decomposing organisms

c. soil retains water from melting permafrost/ice

d. grasses/small plants/herbaceous plants/moss grow

e. (larger plants) create habitat for animals

f. weather/climate may limit plant size/biodiversity

OR

climax community forms

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