Key term
AQA GCSE Biology 8461
Bioenergetics
Cell Biology
Topic overviewEukaryotes and prokaryotesAnimal and plant cellsCell specialisation and differentiationMicroscopyGrowing bacteria and aseptic techniqueCalculating bacterial growth, and testing antiseptics and antibioticsChromosomes, 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 cycledDecompositionWaste management and biodiversityLand use, deforestation and global warmingMaintaining biodiversityTrophic levels and pyramids of biomassTransfer of biomassFactors affecting food securityFarming techniques and sustainable fisheriesRole of biotechnology
Homeostasis and Response
Topic overviewHomeostasisThe nervous system and the reflex arcThe structure of the eye and accommodationMyopia, hyperopia and how they are correctedThe brain and the control of body temperatureHuman endocrine systemInsulin, glucagon and diabetesWater and ion loss, and the production of ureaThe kidneys, ADH and treating kidney failureHormones in human reproductionContraceptionPlant hormones and their uses
Infection and Response
Inheritance, Variation and Evolution
Topic overviewSexual and asexual reproductionMeiosisAdvantages and disadvantages of sexual and asexual reproductionDNA and the genomeDNA as a polymer of four nucleotidesGenetic 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 processCloningDarwin, Lamarck and the acceptance of evolutionSpeciationThe understanding of geneticsEvidence 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
Trophic levels and pyramids of biomass
- 2 things to know
- Paper 2
Overview
Trophic levels from producers through primary, secondary and tertiary consumers to apex predators, animals feeding at more than one level, how decomposers digest dead matter, and drawing pyramids of biomass.
What you need to know
Answer each one before you reveal it.
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Key term
Which organisms are found at trophic level 1?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a trophic level?
Model answer
A feeding level in a food chain, numbered according to how far along the chain the organism feeds.
- 2
Which organisms are found at trophic level 1?
Model answer
Plants and algae.
- 3
Why are plants and algae called producers?
Model answer
They make their own food, producing the biomass that every other organism in the ecosystem depends on.
- 4
What name is given to a herbivore, and which trophic level does it occupy?
Model answer
It is a primary consumer at trophic level 2.
- 5
What is a secondary consumer, and which trophic level does it occupy?
Model answer
A carnivore that eats herbivores, at trophic level 3.
- 6
What is a tertiary consumer?
Model answer
A carnivore that eats other carnivores, at trophic level 4.
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