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
Cells and Control
Growth, differentiation and percentile charts
- 3 things to know
- Paper 1
Overview
Growth by cell division, elongation and differentiation in plants and animals, how differentiation produces specialised cells such as red blood cells and root hair cells, and using percentile charts to monitor a baby's mass, length and head circumference over time.
What you need to know
Answer each one before you reveal it.
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Key term
What is meant by growth in an organism?
Process
Name the two processes that bring about growth in an animal.
Questions from this subtopic
Each one with the model answer underneath.
- 1
What is meant by growth in an organism?
Model answer
A permanent increase in the size or mass of the organism.
- 2
Name the two processes that bring about growth in an animal.
Model answer
Cell division, which increases the number of cells, and differentiation, which turns them into specialised cells.
- 3
Name the three processes involved in the growth of a plant.
Model answer
Cell division, cell elongation and differentiation.
- 4
What is cell elongation in a plant?
Model answer
A new cell takes in water, which fills its vacuole and makes the cell become much longer.
- 5
Which part of a root shows cell elongation?
Model answer
The region just behind the root tip, where newly made cells lengthen and push the tip through the soil.
- 6
Give one difference between the way plants grow and the way animals grow.
Model answer
Plants can keep growing at their tips throughout life, while most animals stop growing once they reach adult size.
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