GCSE Biology
Ecology
Ecology is a core strand in Biology. Work through the topics below in any order, or follow your course — each guide includes explanations, common mistakes and exam-style practice.
Topic guides
Ecosystems & Food Chains
An ecosystem is the interaction of a community of living organisms (biotic) with the non-living (abiotic) parts of their environment.
Open guideAdaptations & Interdependence
Organisms have adaptations – special features that enable them to survive in their specific habitat.
Open guideBiodiversity
Biodiversity is the variety of all the different species of organisms on Earth, or within an ecosystem.
Open guideCycles in Ecosystems
Materials in the natural world are constantly recycled.
Open guideSampling & Measuring Populations
To study an ecosystem, it's often impossible to count every organism.
Open guideTrophic Levels
Trophic levels are the positions an organism occupies in a food chain.
Open guideFood Production
With a growing human population, we need to produce food more efficiently.
Open guideHuman Impact on the Environment
Human activities are having a significant negative impact on the environment at a local, regional, and global level.
Open guide
Revision strategy
Students often slip on the details explained in our guides — read the “common mistakes” section in each topic.
- Alternate between reading a guide and doing timed questions — don’t only re-read notes.
- Return to this hub anytime; new guides appear automatically as we publish them.