Key term
AQA GCSE Combined Science Biology 8464
Bioenergetics
Cell Biology
Topic overviewEukaryotes and prokaryotesAnimal and plant cellsCell specialisation and differentiationMicroscopyChromosomes, mitosis and the cell cycleStem cells in embryos, adults and meristemsTherapeutic cloning, its risks, and cloning plantsDiffusion and the factors affecting its rateSurface area to volume ratio and exchange surfacesOsmosisActive transport
Ecology
Topic overviewLevels of organisation in an ecosystem, and what organisms needCompetition, interdependence and stable communitiesAbiotic factorsBiotic factorsAdaptationsProducers, food chains and sampling with quadrats and transectsPredators, prey and measuring population sizeHow materials are cycledWaste management and biodiversityLand use, deforestation and global warmingMaintaining biodiversity
Homeostasis and Response
Infection and Response
Inheritance, Variation and Evolution
Topic overviewSexual and asexual reproductionMeiosisDNA and the genomeGenetic terms, dominant and recessive allelesPunnett squares, probability and genetic crossesInherited disorders and sex determinationVariationEvolutionSelective breedingWhat genetic engineering is, and what it is used forGM crops, their risks, and the steps of the processEvidence for evolution, and extinctionFossilsResistant bacteriaClassification of living organisms
Organisation
Topic overviewLevels of organisation, and how enzymes workAmylase, proteases and lipasesBile, food tests and the effect of pH on amylaseThe heart, the lungs and double circulationThe pacemaker, the blood vessels and the bloodCoronary heart disease: a non-communicable diseaseHealth issuesRisk factors and causal mechanisms in diseaseSampling, correlation and interpreting risk dataCancerPlant tissues, and transpiration and its rateRoot hair cells, xylem, phloem and stomata
Ecology
Levels of organisation in an ecosystem, and what organisms need
- 3 things to know
- Biology Paper 2
Overview
Population, community, habitat and ecosystem, biotic and abiotic parts, what plants and animals must obtain to survive, and competition and adaptation in rock pools, deserts and streams.
What you need to know
Answer each one before you reveal it.
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Key term
What is meant by a community?
Key term
List the levels of organisation in an ecosystem in order, starting with the smallest.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by a population in an ecosystem?
Model answer
All the organisms of one species living in the same habitat at the same time.
- 2
What is meant by a community?
Model answer
All the populations of the different species that live in the same habitat and interact with each other.
- 3
List the levels of organisation in an ecosystem in order, starting with the smallest.
Model answer
Individual organism, then population, then community, then the whole ecosystem.
- 4
What is a habitat?
Model answer
The place in which an organism lives.
- 5
What is an ecosystem?
Model answer
The interaction of a community of living organisms with the non-living parts of their environment.
- 6
An ecosystem has biotic and abiotic parts. What does each of these words mean?
Model answer
Biotic parts are the living organisms; abiotic parts are the non-living physical and chemical conditions.
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