Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
Year 7 Science · AC9S7U02
Food Webs, Energy Flow and Ecosystem Change
Use food-web models to trace matter and energy, then predict how changes to organisms and environmental conditions can affect populations across an ecosystem
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Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
- A drought reduces grass biomass. Predict two direct and two indirect food-web effects.
- A snake eats frogs and mice. Frog numbers fall. Explain two possible snake responses and identify the data needed to choose between them.
- An introduced plant replaces native grasses but provides poor shelter. Predict why herbivores and small ground animals may respond differently.
- Explain why a food-web model should be combined with field evidence when planning invasive-species management.
- Evaluate the claim “one successful local burn proves fire always increases biodiversity”.
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AC9S7U02 - Food Webs, Energy Flow and Ecosystem Change
Example 1
A drought reduces grass biomass. Predict two direct and two indirect food-web effects.
Example 2
A snake eats frogs and mice. Frog numbers fall. Explain two possible snake responses and identify the data needed to choose between them.
Example 3
An introduced plant replaces native grasses but provides poor shelter. Predict why herbivores and small ground animals may respond differently.
Example 4
Explain why a food-web model should be combined with field evidence when planning invasive-species management.
Curriculum examplesCopied content
Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
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Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
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Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
Curriculum alignmentStart here
Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
Comparable middle-years science internationally includes food chains and food webs, transfer of energy and matter, decomposers, ecological interactions, population responses to environmental change and evaluating ecosystem models. Exact terminology and year placement vary; AC9S7U02 is the authoritative alignment for this resource.
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