DP Biology (last assessment 2024)

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Question 18M.3.SL.TZ1.15

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Date May 2018 Marks available [Maximum mark: 4] Reference code 18M.3.SL.TZ1.15
Level SL Paper 3 Time zone TZ1
Command term Discuss Question number 15 Adapted from N/A
15.
[Maximum mark: 4]
18M.3.SL.TZ1.15

Discuss how abiotic factors can affect the distribution of species in an ecosystem.

[4]

Markscheme

a. organisms have limits of tolerance and zones of stress 

b. listing any two or more abiotic factors 

c. example of named abiotic factor and how it affects distribution of plant/animal species 

d. example of another named abiotic factor and how it affects distribution of plant/animal species 

e. example of a third named abiotic factor and how it affects distribution of plant/animal species

Award up to 3 marks for valid examples:

light limiting photosynthesis (in a forest) dissolved oxygen affecting respiration in an aquatic animal salinity affecting osmosis in an estuarine species most organisms require a suitable temperature range for their metabolism.

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