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
Predators, prey and measuring population size
- 3 things to know
- Biology Paper 2
Overview
Primary, secondary and tertiary consumers, predators and prey and their cycling numbers, estimating a field's dandelions with random quadrats, and using a transect along a footpath.
What you need to know
Answer each one before you reveal it.
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Key term
In the food chain grass to rabbit to stoat to buzzard, name the secondary consumer and explain your choice.
Key term
In the food chain algae to water flea to small fish to pike, which organism is the tertiary consumer?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Put these in the order in which they feed in a food chain: secondary consumer, producer, tertiary consumer, primary consumer.
Model answer
Producer, then primary consumer, then secondary consumer, then tertiary consumer.
- 2
In the food chain grass to rabbit to stoat to buzzard, name the secondary consumer and explain your choice.
Model answer
The stoat, because it eats the rabbit, which is the primary consumer.
- 3
In the food chain algae to water flea to small fish to pike, which organism is the tertiary consumer?
Model answer
The pike, because it is the third consumer along the chain.
- 4
What is a predator?
Model answer
A consumer that kills and eats other animals.
- 5
What is prey?
Model answer
An animal that is killed and eaten by a predator.
- 6
Describe what happens to the numbers of predators and prey in a stable community.
Model answer
They rise and fall in cycles, with the predator numbers changing shortly after the prey numbers.
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