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Environmental ScienceQ&A by dot point
A short Q&A bank for every United States Environmental Science syllabus dot point. Each question and answer is drawn directly from our worked dot-point page, so you can scan key concepts before opening the long-form answer.
Unit 1: The Living World: Ecosystems
- Topic 1.3 Aquatic Biomes: describe the major freshwater and marine biomes and explain how abiotic factors such as salinity, depth, light, temperature and nutrients shape them.2Q&A pairs
- Topic 1.10 Energy Flow and the 10% Rule: explain how energy is lost between trophic levels, apply the 10% rule, and calculate energy transfer and ecological efficiency.2Q&A pairs
- Topic 1.11 Food Chains and Food Webs: describe how food chains and food webs represent the flow of energy and matter, and predict the effects of changes to a food web.2Q&A pairs
- Topic 1.1 Introduction to Ecosystems: explain how species interactions, including predation, symbiosis and competition, shape ecosystems and influence the survival of organisms.2Q&A pairs
- Topic 1.8 Primary Productivity: define gross and net primary productivity, explain the factors that control them, and calculate net primary productivity from data.2Q&A pairs
- Topic 1.2 Terrestrial Biomes: describe the global distribution of the major terrestrial biomes and explain how temperature and precipitation determine the type of biome found in a region.2Q&A pairs
- Topic 1.4 The Carbon Cycle: describe the major reservoirs and fluxes of the carbon cycle and explain how natural processes and human activities move carbon between them.2Q&A pairs
- Topic 1.7 The Hydrologic (Water) Cycle: describe the processes of the water cycle and explain how human activities alter the storage and movement of water.2Q&A pairs
- Topic 1.5 The Nitrogen Cycle: describe the steps of the nitrogen cycle and explain how nitrogen fixation, the role of bacteria and human activities move nitrogen between reservoirs.2Q&A pairs
- Topic 1.6 The Phosphorus Cycle: describe the phosphorus cycle, explain why it has no significant atmospheric component, and explain how phosphorus acts as a limiting nutrient and a pollutant.2Q&A pairs
- Topic 1.9 Trophic Levels: describe the trophic levels of an ecosystem and explain the roles of producers, consumers and decomposers in transferring energy and matter.2Q&A pairs
Unit 2: The Living World: Biodiversity
- Topic 2.6 Adaptations: explain how natural selection produces adaptations and how environmental change shifts which traits are favored over time.2Q&A pairs
- Topic 2.7 Ecological Succession: distinguish primary and secondary succession, describe how communities change over time, and explain the roles of pioneer, keystone and indicator species.2Q&A pairs
- Topic 2.4 Ecological Tolerance: describe the range of tolerance of organisms and explain how tolerance limits determine the distribution and survival of species.2Q&A pairs
- Topic 2.2 Ecosystem Services: describe the four categories of ecosystem services and explain how the disruption of ecosystems affects the services they provide.2Q&A pairs
- Topic 2.1 Introduction to Biodiversity: describe the three levels of biodiversity and explain how genetic and species diversity contribute to ecosystem resilience.2Q&A pairs
- Topic 2.3 Island Biogeography: explain how island size and distance from the mainland determine species richness, and apply the theory to habitat fragments.2Q&A pairs
- Topic 2.5 Natural Disruptions to Ecosystems: describe natural disruptions to ecosystems and explain their short-term and long-term effects on populations and biodiversity.2Q&A pairs
Unit 3: Populations
- Topic 3.5 Age Structure Diagrams: interpret age structure diagrams (population pyramids) to predict population growth, stability or decline.2Q&A pairs
- Topic 3.3 Carrying Capacity: define carrying capacity, explain overshoot and dieback, and interpret population oscillations around the carrying capacity.2Q&A pairs
- Topic 3.8 Demographic Transition: describe the four stages of the demographic transition model and explain how birth and death rates change as a country develops.2Q&A pairs
- Topic 3.1 Generalist and Specialist Species: distinguish generalist from specialist species and explain how a changing or stable environment favors each.2Q&A pairs
- Topic 3.7 Human Population Dynamics: explain the factors that influence human population size and growth, and calculate growth rate from crude birth, death and migration rates.2Q&A pairs
- Topic 3.4 Population Growth and Resource Availability: compare exponential (J-curve) and logistic (S-curve) growth, link them to r- and K-selected species, and calculate growth rate and doubling time.2Q&A pairs
- Topic 3.2 Survivorship Curves: interpret Type I, II and III survivorship curves and link each shape to a species' reproductive and life-history strategy.2Q&A pairs
- Topic 3.6 Total Fertility Rate: define total fertility rate and replacement-level fertility, and explain the factors that raise or lower a country's TFR.2Q&A pairs
Unit 4: Earth Systems and Resources
- Topic 4.4 Earth's Atmosphere: describe the composition of the atmosphere and the four main layers, and explain how temperature changes with altitude.2Q&A pairs
- Topic 4.8 Earth's Geography and Climate: explain how geographic features such as mountains and proximity to water shape regional climate, including rain shadows and El Nino and La Nina.2Q&A pairs
- Topic 4.5 Global Wind Patterns: explain how uneven solar heating and the Coriolis effect drive atmospheric circulation cells and global wind belts.2Q&A pairs
- Topic 4.1 Plate Tectonics: explain how convection in the mantle drives plate movement and describe the three types of plate boundary and their landforms and hazards.2Q&A pairs
- Topic 4.3 Soil Composition and Properties: describe soil texture using the soil triangle, and explain how particle size affects porosity, permeability, water-holding capacity and fertility.2Q&A pairs
- Topic 4.2 Soil Formation and Erosion: explain how soil forms from weathered rock and organic matter, describe the soil horizons, and explain the causes and effects of soil erosion.2Q&A pairs
- Topic 4.7 Solar Radiation and Earth's Seasons: explain how the tilt of Earth's axis and its orbit produce variations in insolation that cause the seasons.2Q&A pairs
- Topic 4.6 Watersheds: define a watershed, describe the factors that affect its characteristics, and explain how land use changes runoff and water quality.2Q&A pairs
Unit 5: Land and Water Use
- Topic 5.16 Aquaculture: describe aquaculture and explain its benefits and environmental costs compared with wild fishing.2Q&A pairs
- Topic 5.2 Clearcutting: describe clearcutting and explain its environmental consequences for soil, water and ecosystems.2Q&A pairs
- Topic 5.11 Ecological Footprints: define the ecological footprint, explain what it measures, and compare footprints between countries and lifestyles.2Q&A pairs
- Topic 5.4 The Impact of Agricultural Practices: explain how tillage, fertilizer use, overgrazing and other farming practices degrade soil and water.2Q&A pairs
- Topic 5.9 Impacts of Mining: compare surface and subsurface mining and explain their environmental consequences, including acid mine drainage and tailings.2Q&A pairs
- Topic 5.8 Impacts of Overfishing: explain how overfishing depletes fish stocks, describe destructive fishing methods, and explain sustainable management.2Q&A pairs
- Topic 5.14 Integrated Pest Management: describe integrated pest management (IPM) and explain how it combines biological, cultural, mechanical and limited chemical control.2Q&A pairs
- Topic 5.12 Introduction to Sustainability: define sustainability and sustainable yield, and explain the indicators used to assess whether resource use is sustainable.2Q&A pairs
- Topic 5.5 Irrigation Methods: compare the main irrigation methods and explain the problems of salinisation, waterlogging and aquifer depletion.2Q&A pairs
- Topic 5.7 Meat Production Methods: compare free-range and feedlot (CAFO) meat production and explain the environmental costs of meat, including its high resource use.2Q&A pairs
- Topic 5.13 Methods to Reduce Urban Runoff: describe methods such as permeable pavement, rain gardens, green roofs and retention ponds that reduce urban stormwater runoff.2Q&A pairs
- Topic 5.6 Pest Control Methods: compare chemical and biological pest control and explain the pesticide treadmill and the evolution of pesticide resistance.2Q&A pairs
- Topic 5.15 Sustainable Agriculture: describe sustainable farming practices that conserve soil and water and maintain long-term productivity.2Q&A pairs
- Topic 5.17 Sustainable Forestry: describe sustainable forestry practices that reduce deforestation while still supplying timber.2Q&A pairs
- Topic 5.3 The Green Revolution: describe the methods and benefits of the Green Revolution and explain its environmental costs.2Q&A pairs
- Topic 5.1 The Tragedy of the Commons: explain how shared, unregulated resources tend to be overexploited, and describe solutions such as regulation and privatisation.2Q&A pairs
- Topic 5.10 Urbanization: explain the environmental effects of urbanization, including impervious surfaces, runoff, the urban heat island, sprawl and saltwater intrusion.2Q&A pairs
Unit 6: Energy Resources and Consumption
- Topic 6.4 Distribution of Natural Energy Resources: explain why energy resources are unevenly distributed and the consequences of that uneven distribution.2Q&A pairs
- Topic 6.13 Energy Conservation: describe strategies for energy conservation and efficiency and explain how they reduce environmental impact.2Q&A pairs
- Topic 6.7 Energy from Biomass: describe how biomass and biofuels are used for energy and evaluate their benefits and drawbacks.2Q&A pairs
- Topic 6.5 Fossil Fuels: explain how fossil fuels form and are used to generate electricity, and describe their environmental impacts, including cogeneration.2Q&A pairs
- Topic 6.3 Fuel Types and Uses: identify the major fuel types (coal, oil, natural gas, biomass) and describe their main uses and relative impacts.2Q&A pairs
- Topic 6.10 Geothermal Energy: describe how geothermal energy is captured and evaluate its benefits and drawbacks.2Q&A pairs
- Topic 6.2 Global Energy Consumption: describe patterns of global energy use and the factors, including development and population, that drive demand.2Q&A pairs
- Topic 6.9 Hydroelectric Power: describe how hydroelectric and tidal power generate electricity and evaluate their benefits and drawbacks.2Q&A pairs
- Topic 6.11 Hydrogen Fuel Cell: explain how a hydrogen fuel cell works and evaluate its benefits and drawbacks.2Q&A pairs
- Topic 6.6 Nuclear Power: explain how nuclear fission generates electricity and describe the benefits and risks, including radioactive waste and half-life.2Q&A pairs
- Topic 6.1 Renewable and Nonrenewable Resources: distinguish renewable from nonrenewable energy resources and explain why the distinction matters for sustainability.2Q&A pairs
- Topic 6.8 Solar Energy: describe how solar energy is captured using photovoltaic, active and passive systems and evaluate its benefits and drawbacks.2Q&A pairs
- Topic 6.12 Wind Energy: describe how wind turbines generate electricity and evaluate the benefits and drawbacks of wind power.2Q&A pairs
Unit 7: Atmospheric Pollution
- Topic 7.7 Acid Rain: explain how acid rain forms from sulfur and nitrogen oxides and describe its environmental impacts.2Q&A pairs
- Topic 7.4 Atmospheric CO2 and Particulates: describe the natural and human sources of atmospheric carbon dioxide and particulate matter and their effects.2Q&A pairs
- Topic 7.5 Indoor Air Pollutants: identify the major indoor air pollutants and their sources and explain why indoor air pollution is a serious health risk.2Q&A pairs
- Topic 7.1 Introduction to Air Pollution: identify the major air pollutants and their sources and distinguish primary from secondary pollutants.2Q&A pairs
- Topic 7.8 Noise Pollution: identify the sources of noise pollution and describe its effects on humans and wildlife.2Q&A pairs
- Topic 7.2 Photochemical Smog: explain how photochemical smog forms from nitrogen oxides, volatile organic compounds and sunlight, and describe its impacts.2Q&A pairs
- Topic 7.6 Reduction of Air Pollutants: describe methods used to reduce air pollution, including regulation, scrubbers, catalytic converters and cleaner fuels.2Q&A pairs
- Topic 7.3 Thermal Inversion: explain how a thermal inversion forms and why it traps air pollution near the ground.2Q&A pairs
Unit 8: Aquatic and Terrestrial Pollution
- Topic 8.8 Bioaccumulation and Biomagnification: distinguish bioaccumulation from biomagnification and explain how toxins concentrate up food chains.2Q&A pairs
- Topic 8.13 Dose Response Curve: interpret a dose-response curve and explain the difference between threshold and linear (non-threshold) responses.2Q&A pairs
- Topic 8.3 Endocrine Disruptors: explain what endocrine disruptors are and how they affect organisms by interfering with hormones.2Q&A pairs
- Topic 8.5 Eutrophication: explain how nutrient pollution causes eutrophication and oxygen depletion in aquatic ecosystems.2Q&A pairs
- Topic 8.2 Human Impacts on Ecosystems: explain how pollution and other human activities disrupt ecosystems and harm organisms.2Q&A pairs
- Topic 8.4 Human Impacts on Wetlands and Mangroves: describe the ecosystem services of wetlands and mangroves and the consequences of destroying them.2Q&A pairs
- Topic 8.12 Lethal Dose 50% (LD50): explain what LD50 measures and how it is used to compare the toxicity of substances.2Q&A pairs
- Topic 8.7 Persistent Organic Pollutants (POPs): describe the properties of persistent organic pollutants and explain why they are especially harmful.2Q&A pairs
- Topic 8.14 Pollution and Human Health: describe how pollutants and pathogens affect human health and how infectious diseases spread through the environment.2Q&A pairs
- Topic 8.11 Sewage Treatment: describe the stages of sewage treatment and explain how they reduce water pollution.2Q&A pairs
- Topic 8.9 Solid Waste Disposal: describe the main methods of solid waste disposal and their environmental impacts.2Q&A pairs
- Topic 8.1 Sources of Pollution: distinguish point and non-point sources of pollution and identify major types of pollutants.2Q&A pairs
- Topic 8.6 Thermal Pollution: explain how thermal pollution occurs and why warmer water harms aquatic ecosystems.2Q&A pairs
- Topic 8.10 Waste Reduction Methods: describe methods of reducing waste, including the waste hierarchy, recycling and composting.2Q&A pairs
Unit 9: Global Change
- Topic 9.9 Endangered Species: explain the factors that make species vulnerable to extinction and describe how endangered species are protected.2Q&A pairs
- Topic 9.5 Global Climate Change: describe the evidence and effects of global climate change and explain the role of positive feedback loops.2Q&A pairs
- Topic 9.10 Human Impacts on Biodiversity: identify the major human causes of biodiversity loss (HIPPCO) and explain why declining biodiversity matters.2Q&A pairs
- Topic 9.4 Increases in the Greenhouse Gases: identify the human activities that increase greenhouse gases and explain why their concentrations are rising.2Q&A pairs
- Topic 9.8 Invasive Species: explain what makes a species invasive and describe the impacts of invasive species and how they are managed.2Q&A pairs
- Topic 9.7 Ocean Acidification: explain how rising carbon dioxide acidifies the ocean and describe the effects on marine organisms.2Q&A pairs
- Topic 9.6 Ocean Warming: explain how the ocean absorbs heat and describe the effects of ocean warming on marine ecosystems and sea level.2Q&A pairs
- Topic 9.2 Reducing Ozone Depletion: describe the strategies and international agreements used to reduce ozone depletion and how the ozone layer is recovering.2Q&A pairs
- Topic 9.1 Stratospheric Ozone Depletion: explain how CFCs deplete stratospheric ozone and describe the consequences of a thinner ozone layer.2Q&A pairs
- Topic 9.3 The Greenhouse Effect: explain the greenhouse effect, identify the major greenhouse gases, and distinguish the natural effect from the enhanced effect.2Q&A pairs