Key term
Edexcel GCSE Combined Science Biology 1SC0
Key Concepts in Biology
Topic overviewEukaryotic and prokaryotic cellsSpecialised cells and their adaptationsMicroscopes and magnification calculationsSize, scale and units in cell biologyEnzyme action and denaturationFactors affecting enzyme activityEnzymes in synthesis and digestion, and rate calculationsDiffusion, osmosis and active transportOsmosis in potatoes and percentage change in mass
Cells and Control
Genetics
Topic overviewMeiosis and the formation of gametesDNA structure, genes and the genomeExtracting DNA from fruitAlleles, genotype and phenotypeMonohybrid crosses and sex determinationProbability and ratios from genetic crossesCauses of variation: genes and environmentThe Human Genome ProjectGenetic variation and the effects of mutation
Natural Selection and Genetic Modification
Health, Disease and the Development of Medicines
Topic overviewHealth, disease and susceptibilityPathogens and common infectionsHow pathogens spread, and the virus life cycleSexually transmitted infectionsPhysical barriers and chemical defencesThe immune system, immunisation and herd immunityAntibiotics and developing new medicinesLifestyle factors and non-communicable diseaseTreatments for cardiovascular disease
Plant Structures and Their Functions
Animal Coordination, Control and Homeostasis
Exchange and Transport in Animals
Topic overviewWhy multicellular organisms need exchange surfacesAlveoli and gas exchangeThe blood and its componentsArteries, veins and capillariesThe heart and the circulatory systemCellular respiration as an exothermic reactionAerobic and anaerobic respiration comparedInvestigating the rate of respirationCardiac output, stroke volume and heart rate
Ecosystems and Material Cycles
Ecosystems and Material Cycles
Levels of organisation and interdependence
- 3 things to know
- Paper 2
Overview
Individuals, populations, communities, habitats and ecosystems and their order, interdependence through food, shelter, pollination and seed dispersal, how losing one species affects others in a food web, and why an interdependent community stays balanced.
What you need to know
Answer each one before you reveal it.
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Key term
What is a community?
Key term
What is an ecosystem?
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is a population?
Model answer
A population is all the organisms of one species living in the same place at the same time.
- 2
What is a community?
Model answer
A community is all the populations of the different species living together in one habitat.
- 3
What is an ecosystem?
Model answer
An ecosystem is a community of organisms together with the non-living surroundings they interact with.
- 4
What is a habitat?
Model answer
A habitat is the particular place in which an organism lives.
- 5
Place the terms community, individual organism, ecosystem and population in order from the smallest level of organisation to the largest.
Model answer
Individual organism, then population, then community, then ecosystem.
- 6
A wood contains 300 oak trees, 40 badgers and several thousand woodlice. Which level of organisation do the 40 badgers represent?
Model answer
They are a population, because they are all members of one species living in the same place.
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