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
Homeostasis and Response
Myopia, hyperopia and how they are corrected
- 3 things to know
- Paper 2
Overview
How the eye focuses on distant objects as the ciliary muscles relax and the lens is pulled thin, short and long sightedness and where light is focused, and correction by spectacles with concave or convex lenses, contact lenses, laser surgery and lens replacement.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
In a long sighted eye, where would rays from a near object be brought to a focus?
Key term
What do short sightedness and long sightedness have in common?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What happens to the ciliary muscles when the eye focuses on a distant object?
Model answer
They relax.
- 2
What happens to the suspensory ligaments when the eye focuses on a distant object?
Model answer
They are pulled tight.
- 3
Describe the shape of the lens when viewing a distant object, and how much it refracts light.
Model answer
It is pulled thin, and it refracts the light rays only slightly.
- 4
Explain why relaxing the ciliary muscles makes the lens thinner.
Model answer
Relaxed ciliary muscles allow the suspensory ligaments to tighten, and they pull the lens flat.
- 5
What is the everyday name for myopia?
Model answer
Short sightedness.
- 6
What is the everyday name for hyperopia?
Model answer
Long sightedness.
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