DP Biology (last assessment 2024)

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Question 18M.3.SL.TZ1.a

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

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

[Source: climatica.org.uk]

 

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/grow 

e. (larger plants) create habitats for animals 

f. weather/climate may limit plant size/biodiversity
OR
climax community forms

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