Biology A-Level
open systems
What open systems means in Biology A-Level, as defined for AQA.
Definition of open systems
Check what you remember
Read the wording for your board, then hide it and explain open systems in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
No ecosystem is closed, because organisms migrate across the boundary, energy enters as light and leaves as heat, and nutrients are carried in and out.
Topics that use open systems
- Populations in ecosystems (A-level only) (AQA A-Level)
Related terms
- abiotic components
- abiotic factors
- belt transect
- community
- competitive exclusion
- conflicting human needs
- Conservation
- correlation not causation
Using open systems in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
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