Key term
OCR A-Level Biology H420
Cell Structure
Biological Molecules
Nucleotides and Nucleic Acids
Enzymes
Biological Membranes
Cell Division, Cell Diversity and Cellular Organisation
Exchange Surfaces
Transport in Animals
Transport in Plants
Communicable Diseases, Disease Prevention and the Immune System
Biodiversity
Classification and Evolution
Communication and Homeostasis
Excretion as an Example of Homeostatic Control
Neuronal Communication
Hormonal Communication
Plant and Animal Responses
Topic overviewTropisms and plant responses to stress and herbivoryPlant hormones and their commercial usesThe nervous system and the brainReflex actions and the knee jerk reflexFight or flight and the control of heart rateThe structure of skeletal muscleThe neuromuscular junction and the sliding filament model
Photosynthesis
Respiration
Cellular Control
Patterns of Inheritance
Manipulating Genomes
Cloning and Biotechnology
Topic overviewNatural plant cloning and taking cuttingsMicropropagationAdvantages and disadvantages of plant cloningAnimal cloning: embryo twinning and nuclear transferAdvantages and disadvantages of animal cloningMicroorganisms in food productionAseptic techniqueFermentation and its conditionsThe microbial growth curveImmobilised enzymes
Ecosystems
Populations and Sustainability
Practical Skills and Mathematical Requirements
Classification and Evolution
- 5 subtopics
- 7 things to know
- Components 02 and 03
What Classification and Evolution covers
Classification and evolution closes Module 4. It covers the taxonomic hierarchy and binomial naming, the five kingdoms and the three domains, phylogeny and the evidence that supports evolution, the sources of variation and the kinds of adaptation, and natural selection.
Where it is assessed
Components 02 and 03
Module 4 is examined on Biological Diversity, then the unified paper.
Check the OCR specification ↗The 5 subtopics
Each one has its own page.
- The taxonomic hierarchy and binomial namingDomain, kingdom, phylum, class, order, family, genus and species in order, and how the binomial system names an organism and why it helps.Open →
- The five kingdoms and the three domainsThe defining features of Prokaryotae, Protoctista, Fungi, Plantae and Animalia, and why molecular evidence replaced them with Bacteria, Archaea and Eukarya.Open →
- Phylogeny and the evidence for evolutionWhat phylogeny means and how classification reflects it, and the fossil, DNA and other molecular evidence that supports evolution.Open →
- Variation and adaptationIntraspecific and interspecific variation, continuous and discontinuous variation with their genetic and environmental causes, and anatomical, physiological and behavioural adaptation.Open →
- Natural selection and resistanceWhat natural selection requires, selection pressure and the resulting change in allele frequency, and how pesticide and antibiotic resistance evolve.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Compare continuous and discontinuous variation.
Process
Explain natural selection.
Key term
Describe how a species is named using the binomial system.
Key term
Define the term phylogeny.
Key term
Describe the characteristics of continuous variation.
Process
Explain how natural selection leads to changes in allele frequency.
Take Classification and Evolution further
The same content, four other ways.
Commonly confused
Pairs that lose marks when they are blurred together.
Intraspecific variation vs Interspecific variation
Intraspecific variation: differences among individuals belonging to the same species. Interspecific variation: differences among individuals belonging to different species.
Questions from this topic
Each one with the model answer underneath.
- 1
Name the first (highest) level in the taxonomic hierarchy.
Model answer
Domain
- 2
What is the second level in the taxonomic hierarchy, below domain?
Model answer
Kingdom
- 3
Which taxonomic level comes immediately below kingdom?
Model answer
Phylum
- 4
What taxonomic rank falls between phylum and order?
Model answer
Class
- 5
Name the taxonomic level that comes after class but before family.
Model answer
Order
- 6
Which level of the taxonomic hierarchy lies between order and genus?
Model answer
Family
What is inside Levo
Six ways to work the same material.
Classification and Evolution revision questions
- What does Classification and Evolution cover in OCR A-Level Biology?
- 5 subtopics: the taxonomic hierarchy and binomial naming, the five kingdoms and the three domains, phylogeny and the evidence for evolution, variation and adaptation and natural selection and resistance. Each one has its own page with questions and model answers.
- How is Classification and Evolution organised?
- By the OCR H420 specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in Classification and Evolution, on a schedule.
Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.
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