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
Bioenergetics
The photosynthesis reaction and the uses of glucose
- 3 things to know
- Biology Paper 1
Overview
The word equation and chemical formulae for photosynthesis, why it is endothermic and needs light energy transferred to the chloroplasts, how glucose is used for respiration, starch, fat or oil, cellulose and amino acids, and the nitrate ions needed to make proteins.
What you need to know
Answer each one before you reveal it.
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Key term
What supplies the energy that drives photosynthesis?
Key term
Give the chemical formulae of carbon dioxide, water, oxygen and glucose.
Questions from this subtopic
Each one with the model answer underneath.
- 1
State the word equation for photosynthesis.
Model answer
Carbon dioxide + water → glucose + oxygen.
- 2
What supplies the energy that drives photosynthesis?
Model answer
Light from the environment.
- 3
Give the chemical formulae of carbon dioxide, water, oxygen and glucose.
Model answer
CO₂, H₂O, O₂ and C₆H₁₂O₆.
- 4
Explain why photosynthesis is described as an endothermic reaction.
Model answer
Because energy is taken in from the environment during the reaction rather than released.
- 5
Into which structures of a plant cell is energy transferred by light during photosynthesis?
Model answer
The chloroplasts.
- 6
A potted plant is left in a completely dark cupboard. Explain why it cannot photosynthesise.
Model answer
Photosynthesis is endothermic and needs energy transferred to the chloroplasts by light, so with no light the reaction cannot take place.
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