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
Exchange and Transport in Animals
Why multicellular organisms need exchange surfaces
- 3 things to know
- Paper 2
Overview
The oxygen, carbon dioxide, water, glucose, mineral ions and urea that must be transported in an organism, calculating surface area to volume ratios of cubes, and why single-celled organisms and flatworms rely on diffusion while large animals need exchange surfaces and transport systems.
What you need to know
Answer each one before you reveal it.
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Key term
Name the waste gas that must be carried away from respiring cells.
Key term
State why water must be moved around an organism.
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name the gas that must be transported from the lungs to respiring cells.
Model answer
Oxygen is transported from the lungs to respiring cells.
- 2
Name the waste gas that must be carried away from respiring cells.
Model answer
Carbon dioxide is carried away from respiring cells.
- 3
State why water must be moved around an organism.
Model answer
Every cell needs water as the solvent in which its chemical reactions take place.
- 4
Name the dissolved food molecule that is carried to cells for respiration.
Model answer
Glucose is carried in solution to cells for respiration.
- 5
State where dissolved food molecules pass into the blood.
Model answer
Dissolved food molecules are absorbed into the blood through the wall of the small intestine.
- 6
State why mineral ions must be transported to cells.
Model answer
Cells need mineral ions to build substances such as haemoglobin and to keep their chemical processes working.
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