Key term
Eduqas A-Level Biology A400QS
Biological Molecules
Cell Structure and Organisation
Cell Membranes and Transport
Enzymes
Nucleic Acids and Their Functions
Importance of ATP
Photosynthesis
Respiration
Microbiology
Population Size and Ecosystems
Topic overviewPopulation growth and its measurementThe population growth curve and carrying capacityDensity dependent and density independent factorsSampling abundance and distributionEcosystems, habitats and communitiesEnergy transfer and pyramids of biomassSuccessionDecomposition and the carbon cycleThe nitrogen cycle and human interventionEutrophication and the effects of drainage
Human Impact on the Environment
Classification and Biodiversity
Topic overviewThe need for classification and the taxonomic hierarchyThe three domain and five kingdom systemsCharacteristic features of the five kingdomsAssessing relatedness by physical features and biochemistryThe species concept and the binomial systemBiodiversity, adaptation and natural selectionMeasuring biodiversity in a habitatGenetic and molecular measures of biodiversity
Mitosis and Meiosis
Sexual Reproduction in Humans
Sexual Reproduction in Plants
Inheritance
Variation and Evolution
Application of Reproduction and Genetics
Topic overviewThe Human Genome Project, other sequenced genomes and genomics in healthcareScreening embryos, stem cells and the ethical issuesGenetic fingerprinting, PCR and electrophoresis in forensic workRecombinant DNA and the production of human insulinGenetically modified crops and gene therapy
Adaptations for Gas Exchange
Topic overviewSurface area to volume ratio and gas exchange in small organismsSpecialised respiratory surfaces and the need for ventilationGills and counter current flow in bony fishThe human breathing system and its histologyVentilation and gas exchange in humansThe insect tracheal systemThe angiosperm leaf, stomata and gas exchange
Adaptations for Transport
Topic overviewVascular systems compared across animal groupsThe mammalian heart and blood vesselsThe cardiac cycle and its controlBlood, haemoglobin and dissociation curvesThe Bohr effect, chloride shift and tissue fluidThe root and the uptake of waterThe endodermis and the entry to the xylemXylem, transpiration and cohesion-tensionThe potometer and xerophytes and hydrophytesPhloem and translocation
Adaptations for Nutrition
Homeostasis and the Kidney
The Nervous System
Immunology and Disease: Disease and Its TransmissionImmunology
Immunology and Disease: AntibioticsImmunology
Immunology and Disease: The Immune ResponseImmunology
Human Musculoskeletal Anatomy: Skeletal TissuesMusculoskeletal
Topic overviewCartilage and its three typesThe composition and functions of compact boneBone remodelling and the Haversian systemRickets, osteomalacia, osteoporosis and brittle bone diseaseThe structure of skeletal muscleThe sliding filament theoryFast and slow twitch fibres, and energy for contraction
Human Musculoskeletal Anatomy: Structure and Function of the SkeletonMusculoskeletal
Human Musculoskeletal Anatomy: JointsMusculoskeletal
Neurobiology and Behaviour: The BrainNeurobiology
Neurobiology and Behaviour: NeuroscienceNeurobiology
Population Size and Ecosystems
- 10 subtopics
- 30 things to know
- Component 1
What Population Size and Ecosystems covers
Population Size and Ecosystems is examined in Component 1, Energy for Life. It covers population growth and its measurement, the population growth curve and carrying capacity, density dependent and density independent factors, sampling abundance and distribution, ecosystems, habitats and communities, energy transfer and pyramids of biomass, succession, decomposition and the carbon cycle, the nitrogen cycle and human intervention and eutrophication and the effects of drainage.
Where it is assessed
Component 1
Energy for Life, whose Core Concepts are also assessed in the other two papers.
Check the Eduqas specification ↗The 10 subtopics
Each one has its own page.
- Population growth and its measurementFour processes that change the size of a population, population's size at the end of the year and birth rate.Open →
- The population growth curve and carrying capacityFour phases of a typical population growth curve, stationary phase and carrying capacity.Open →
- Density dependent and density independent factorsDensity dependent factor, density independent factor and relationship between a predator and its prey over time.Open →
- Sampling abundance and distributionPercentage cover and frequency, in quadrat sampling.Open →
- Ecosystems, habitats and communitiesBiotic factors, very small ecosystem and very large ecosystem.Open →
- Energy transfer and pyramids of biomassTrophic level, gross primary production and net primary production.Open →
- SuccessionPrimary succession, secondary succession and pioneer species.Open →
- Decomposition and the carbon cycleThree conditions that speed up decomposition, three processes that return carbon dioxide to the atmosphere and carbon sink.Open →
- The nitrogen cycle and human interventionNitrogen fixation, two kinds of nitrogen-fixing bacteria and economic importance of the nitrogen cycle to food production.Open →
- Eutrophication and the effects of drainageTwo sources of the nutrients that cause it, algal bloom and effect on the animals in the water.Open →
What you need to know
Answer each one before you reveal it.
Your recallNot started
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Which kind of factor regulates a population, how do predator and prey numbers interact, and how would you test it?
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What is a population?
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Name the four phases of a typical population growth curve.
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Why must a habitat be sampled rather than counted completely?
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What is a trophic level?
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What is succession?
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What is a decomposer?
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In what form do plants take up nitrogen?
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What is eutrophication?
Process
Name the four processes that change the size of a population.
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What happens during the lag phase?
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What is a density dependent factor?
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What is a quadrat?
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What is an ecosystem?
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Name the trophic levels of a simple food chain.
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What is primary succession?
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Why is organic breakdown essential to an ecosystem?
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Why can plants not use nitrogen gas directly?
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Name two sources of the nutrients that cause eutrophication.
Process
Write the relationship between births, deaths, immigration, emigration and population change.
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What happens during the exponential phase?
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Name three density dependent factors.
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Why must quadrats be placed randomly?
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What is a habitat?
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What is biomass?
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What is secondary succession?
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Name three conditions that speed up decomposition.
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What is nitrogen fixation?
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Why does fertiliser reach the water rather than staying in the soil?
Take Population Size and Ecosystems further
The same content, four other ways.
Questions from this topic
Each one with the model answer underneath.
- 1
What is a population?
Model answer
All the individuals of one species living in the same place at the same time and able to interbreed.
- 2
Name the four processes that change the size of a population.
Model answer
Births, deaths, immigration and emigration.
- 3
Write the relationship between those four processes and population change.
Model answer
Population change equals births plus immigration, minus deaths and emigration.
- 4
What is immigration?
Model answer
The movement of individuals into a population from elsewhere.
- 5
What is emigration?
Model answer
The movement of individuals out of a population to elsewhere.
- 6
A population of 5,000 has 400 births, 250 deaths, 90 immigrants and 40 emigrants in a year. What is the change?
Model answer
400 plus 90 is 490 added, and 250 plus 40 is 290 lost, so the population rises by 200.
What is inside Levo
Six ways to work the same material.
Population Size and Ecosystems revision questions
- What does Population Size and Ecosystems cover in Eduqas A-Level Biology?
- 10 subtopics: population growth and its measurement, the population growth curve and carrying capacity, density dependent and density independent factors, sampling abundance and distribution, ecosystems, habitats and communities, energy transfer and pyramids of biomass, succession, decomposition and the carbon cycle, the nitrogen cycle and human intervention and eutrophication and the effects of drainage. Each one has its own page with questions and model answers.
- How is Population Size and Ecosystems organised?
- By the Eduqas A400QS specification, subtopic by subtopic, so it matches the order you are taught it in.
Every question in Population Size and Ecosystems, 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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