Process
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
Human impact on ecosystems and biodiversity
- 3 things to know
- Paper 2
Overview
Biodiversity, the harm and benefits of fish farming, non-indigenous species and their effects on native wildlife, eutrophication from fertiliser and sewage, why biodiversity keeps ecosystems stable, conserving endangered species through captive breeding and protected habitats, reforestation, and the economic value of biodiversity.
What you need to know
Answer each one before you reveal it.
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Key term
What is biodiversity?
Key term
Describe two ways in which fish farming can damage the surrounding ecosystem.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is biodiversity?
Model answer
Biodiversity is the variety of different species living in an area or on Earth as a whole.
- 2
Describe two ways in which fish farming can damage the surrounding ecosystem.
Model answer
Uneaten food and fish waste enrich the water and cause algal growth, and parasites and diseases spread from the cages to wild fish.
- 3
Give one way in which fish farming can benefit biodiversity.
Model answer
It reduces the need to catch wild fish, allowing overfished wild populations to recover.
- 4
What is a non-indigenous species?
Model answer
A non-indigenous species is one that has been brought into an area where it does not naturally live.
- 5
Explain how an introduced species can reduce the numbers of a native species.
Model answer
It competes with the native species for the same food and space, or preys on it, so native numbers fall.
- 6
Give one way, other than competition or predation, in which an introduced species can harm native wildlife.
Model answer
It can bring in a new disease that the native species have no resistance to.
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