Date | May 2018 | Marks available | 4 | Reference code | 18M.3.SL.TZ1.15 |
Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
Command term | Discuss | Question number | 15 | Adapted from | N/A |
Question
Discuss how abiotic factors can affect the distribution of species in an ecosystem.
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.