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Biology - annotated exemplar Level 3 AS91604
Demonstrate understanding of how an animal maintains a stable internal environment (3.2)
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This annotated exemplar is intended for teacher use only. The student work shown does not always represent a complete sample of what is required. Selected extracts are used, focused on the grade boundaries, in order to assist assessors to make judgements at the national standard.
Low Excellence
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For Excellence, the student needs to demonstrate comprehensive understanding of how an animal maintains a stable internal environment. This involves linking biological ideas, see Explanatory Note (EN) 4, about maintaining a stable internal environment in an animal, by at least one of:
This student has described and explained the purpose (1), components (2) and the mechanism (3) of osmoregulation in Chinook salmon. Biological ideas are used to explain how a specific disruption results in responses to re-establish a stable internal environment (4). Some biological ideas linking the significance of osmotic balance in terms adaptive advantage are discussed (5). For a more secure Excellence, the student could:
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High Merit
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For Merit, the student needs to demonstrate in-depth understanding of how an animal maintains a stable internal environment. This involves using biological ideas, see Explanatory Note (EN) 4, 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 (EN3) to re-establish a stable internal environment. This student has described and explained the purpose (1), components (2) and the mechanism (3) of osmoregulation in Chinook salmon. Biological ideas are used to explain how a specific disruption results in responses to re-establish a stable internal environment (4). An attempt is made to link biological ideas on the significance of osmoregulation in terms of its adaptive advantage (5). To reach Excellence, the student could link biological ideas further to:
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Low Merit
| Commentary | ||
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For Merit, the student needs to demonstrate in-depth understanding of how an animal maintains a stable internal environment. This involves using biological ideas, see Explanatory Note (EN) 4, 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 (EN3) to re-establish a stable internal environment. This student has described and explained the purpose (1), components (2) and the mechanism (3) of osmoregulation in Chinook salmon. Some biological ideas are used to describe and explain how a specific disruption results in responses to re-establish a stable internal environment (4). For a more secure Merit, the student could use biological ideas to give a more in-depth explanation of:
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High Achieved
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For Achieved, the student needs to demonstrate understanding of how an animal maintains a stable internal environment. This involves using biological ideas, see Explanatory Note (EN) 4, to describe a control system (EN3) by which an animal maintains a stable internal environment. Annotated diagrams or models may be used to support the description. This student has described and partly explained the purpose (1), components (2) and the mechanism (3) of osmoregulation in Chinook salmon. Some biological ideas are used to describe and partly explain how a specific disruption results in responses to re-establish osmotic balance (4). To reach Merit, the student could use biological ideas to explain in more depth:
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Low Achieved
| Commentary | ||
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For Achieved, the student needs to demonstrate understanding of how an animal maintains a stable internal environment. This involves using biological ideas, see Explanatory Note (EN) 4, to describe a control system (EN3) by which an animal maintains a stable internal environment. Annotated diagrams or models may be used to support the description. This student has described the purpose (1) and components (2) of osmoregulation in Chinook salmon. Some biological ideas are used to describe the mechanism of (3), and disruption to this control system (4). For a more secure Achieved, the student could use biological ideas to give a more detailed description of the:
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High Not Achieved
| Commentary | ||
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For Achieved, the student needs to demonstrate understanding of how an animal maintains a stable internal environment. This involves using biological ideas, see Explanatory Note (EN) 4, to describe a control system (EN3) by which an animal maintains a stable internal environment. Annotated diagrams or models may be used to support the description. This student has demonstrated limited understanding by describing the purpose (1) and components (2) of osmoregulation in Chinook salmon. Some biological ideas are briefly considered to describe the mechanism of (3), and disruption to this system (4). To reach Achieved, the student could use biological ideas to give a more thorough description of:
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