Ecosystems
Use ecological terms precisely and explain interactions through niches, food webs, competition and predation.
How to study National 5 Biology
Move between biological structures, processes, experimental evidence, data and justified explanations while using current official materials for exact paper and assignment conditions.
Core concepts
Concept 1
Species, biodiversity, population, producer, consumer, herbivore, carnivore, omnivore, predator, prey, food chain and food web.
Exam cue: Match the ecological term to the exact level described.
Concept 2
An ecosystem contains a community in a habitat together with the non-living components with which it interacts.
Exam cue: Follow several links when predicting a food-web effect.
Concept 3
A niche is an organism’s role, including resource requirements, interactions and tolerated conditions.
Exam cue: Name the scarce resource when explaining competition.
Concept 4
Competition occurs when resources are scarce; intraspecific competition is usually more intense than interspecific competition.
Risk pitfalls and guardrails
Calling one population a community.
Guardrail: Check the biological level, direction, location, units and whether the evidence supports the strength of the claim.
Defining a niche as only the place an organism lives.
Guardrail: Check the biological level, direction, location, units and whether the evidence supports the strength of the claim.
Assuming a food-web change affects only one linked species.
Guardrail: Trace each causal link and distinguish matter cycling from one-way energy transfer.
Memory anchors
Population
All members of one species in a particular area.
Community
All the populations living together in a habitat.
Ecosystem
A community plus the non-living components with which it interacts.
Niche
An organism’s role, resource needs, interactions and tolerated conditions.
Interspecific competition
Competition between individuals of different species.
Intraspecific competition
Competition within one species for all required resources.
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
What is a species?
What is a population?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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