Key term
AQA GCSE Combined Science Biology 8464
Bioenergetics
Cell Biology
Topic overviewEukaryotes and prokaryotesAnimal and plant cellsCell specialisation and differentiationMicroscopyChromosomes, mitosis and the cell cycleStem cells in embryos, adults and meristemsTherapeutic cloning, its risks, and cloning plantsDiffusion and the factors affecting its rateSurface area to volume ratio and exchange surfacesOsmosisActive transport
Ecology
Topic overviewLevels of organisation in an ecosystem, and what organisms needCompetition, interdependence and stable communitiesAbiotic factorsBiotic factorsAdaptationsProducers, food chains and sampling with quadrats and transectsPredators, prey and measuring population sizeHow materials are cycledWaste management and biodiversityLand use, deforestation and global warmingMaintaining biodiversity
Homeostasis and Response
Infection and Response
Inheritance, Variation and Evolution
Topic overviewSexual and asexual reproductionMeiosisDNA and the genomeGenetic terms, dominant and recessive allelesPunnett squares, probability and genetic crossesInherited disorders and sex determinationVariationEvolutionSelective breedingWhat genetic engineering is, and what it is used forGM crops, their risks, and the steps of the processEvidence for evolution, and extinctionFossilsResistant bacteriaClassification of living organisms
Organisation
Topic overviewLevels of organisation, and how enzymes workAmylase, proteases and lipasesBile, food tests and the effect of pH on amylaseThe heart, the lungs and double circulationThe pacemaker, the blood vessels and the bloodCoronary heart disease: a non-communicable diseaseHealth issuesRisk factors and causal mechanisms in diseaseSampling, correlation and interpreting risk dataCancerPlant tissues, and transpiration and its rateRoot hair cells, xylem, phloem and stomata
Ecology
Abiotic factors
- 3 things to know
- Biology Paper 2
Overview
The seven abiotic factors, dissolved oxygen in water, soil pH and minerals, wind direction, and how moisture, warming, acid rain, shelter and light change a community.
What you need to know
Answer each one before you reveal it.
Your recallNot started
Key term
Which abiotic factor matters to animals living in water but not to animals living on land?
Evaluation
Why is the direction of the wind, as well as its strength, an abiotic factor?
Questions from this subtopic
Each one with the model answer underneath.
- 1
Name seven abiotic factors that can affect a community.
Model answer
Light intensity, temperature, moisture level, soil pH and mineral content, wind intensity and direction, carbon dioxide level for plants, and oxygen level for aquatic animals.
- 2
Which abiotic factor matters to animals living in water but not to animals living on land?
Model answer
The level of oxygen dissolved in the water.
- 3
Give two abiotic features of soil that affect which plants can grow in it.
Model answer
Its pH and its mineral content.
- 4
Why is the direction of the wind, as well as its strength, an abiotic factor?
Model answer
A steady wind from one direction dries and damages one side of a plant, so growth is lopsided and exposed sides support fewer plants.
- 5
Explain how a fall in the moisture level of soil would affect the plants growing in it.
Model answer
The plants take up less water, so they wilt and photosynthesise more slowly, and drought-resistant species replace those needing damp soil.
- 6
A stream is warmed by water released from a factory. Explain the effect on the fish living in it.
Model answer
Warmer water holds less dissolved oxygen, so fish that need a high oxygen level die or move away.
Other ways to work this
The same content, four other ways.
What is inside Levo
Six ways to work the same material.
Every question in Ecology, 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.
Or £46 a year, about £3.83 a month. Cancel anytime.