4.1 Biodiversity: What are the impacts of human activity on ecosystems?
Evaluate local and global human impacts on biodiversity while connecting ecosystem and metabolic foundations from Unit 1.
How to study WJEC GCSE The Sciences
Move from a scientific model to a prediction or method, collect or interpret evidence, show quantitative working and finish with a conclusion whose limits match the data.
Core concepts
Concept 1
Measure and compare biodiversity using appropriate sampling evidence.
Exam cue: Identify the unit, entered tier, supplied reference material, command word and relevant scientific enquiry skill.
Concept 2
Explain local effects of pollution, land use and resource management.
Exam cue: Connect the human activity to an abiotic or biotic change, then trace its effect through populations and biodiversity.
Concept 3
Evaluate global ecosystem impacts and conservation responses.
Exam cue: Use scientific terminology, show quantitative working with units, and connect conclusions to data and the stated model.
Concept 4
Official subtopics: 4.1.1 Impact of human activity on local ecosystems; 4.1.2 Impact of human activity on the global ecosystem.
Concept 5
Scientific enquiry and mathematical skills apply in this topic; bold amplification is Higher Tier only.
Risk pitfalls and guardrails
Assuming one sample represents an ecosystem or offering conservation claims without evidence.
Guardrail: Do not import outgoing 3430QD content, another science route, a fixed required-practical list or unsupported tier and connection assumptions.
Recalling a fact without applying it to the observation, data, practical method or unfamiliar context.
Guardrail: Use the live secure pack: Task A may use groups of up to three; Task B is individual and highly controlled. Two enquiries are selected by the centre from three.
Importing content, required practicals, tier rules or paper structure from the outgoing WJEC or another awarding-body route.
Guardrail: Bold amplification is Higher-only. Units 1-6 may mix tiers, but Unit 7 is untiered.
Memory anchors
Biodiversity
The variety of living organisms in an area or on Earth.
Quadrat
A frame used to sample organisms in a defined area.
Transect
A line or belt along which distribution is sampled.
Bioaccumulation
Build-up of a substance in an organism over time.
Conservation
Protection and managed use of species, habitats and genetic diversity.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A species has a mean density of 8 plants per m² in a 120 m² field. What population estimate follows? Limit the ecological conclusion to representative sampling and the stated human impact. Check whether the conclusion exceeds the evidence.
Quadrat counts are 5, 7, 6 and 6. What is the mean count? Limit the ecological conclusion to representative sampling and the stated human impact. Distinguish correlation from a supported causal explanation.
Answer all questions to submit.
Next step personalized recommendations
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Move forward only after this module is stable.
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