Home > Subjects > Biology > Level 3 > 3.4 Internal Environments > Achievement criteria
- Subject: Biology
- AS: AS 91604
- Level: 3
- Credits: 3
- Internal
Biology 3.4 Demonstrate understanding of how an animal maintains a stable internal environment
Achievement criteria
Achievement
Demonstrate understanding of how an animal maintains a stable internal environment.
This involves using biological ideas to describe a control system by which an animal maintains a stable internal environment. Annotated diagrams or models may used to support the description.
Achievement with merit
Demonstrate in-depth understanding of how an animal maintains a stable internal environment.
This involves using biological ideas to explain how or why an animal maintains a stable internal environment. This includes explaining how a specific disruption results in responses within a control system to re-establish a stable internal environment.
Achievement with excellence
Demonstrate comprehensive understanding of how an animal maintains a stable internal environment.
This involves linking biological ideas about maintaining a stable internal environment in an animal. This includes at least one of:
- a discussion of the significance of the control system in terms of its adaptive advantage
- an explanation of the biochemical and/or biophysical processes underpinning the mechanism (such as equilibrium reactions, changes in membrane permeability, metabolic pathways)
- an analysis of a specific example of how external and/or internal environmental influences result in a breakdown of the control system.
